Commit | Line | Data |
---|---|---|
f71d20e9 | 1 | /* |
1da177e4 | 2 | Copyright (C) 2002 Richard Henderson |
51f3d0f4 | 3 | Copyright (C) 2001 Rusty Russell, 2002, 2010 Rusty Russell IBM. |
1da177e4 LT |
4 | |
5 | This program is free software; you can redistribute it and/or modify | |
6 | it under the terms of the GNU General Public License as published by | |
7 | the Free Software Foundation; either version 2 of the License, or | |
8 | (at your option) any later version. | |
9 | ||
10 | This program is distributed in the hope that it will be useful, | |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | GNU General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU General Public License | |
16 | along with this program; if not, write to the Free Software | |
17 | Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
18 | */ | |
9984de1a | 19 | #include <linux/export.h> |
1da177e4 | 20 | #include <linux/moduleloader.h> |
6d723736 | 21 | #include <linux/ftrace_event.h> |
1da177e4 | 22 | #include <linux/init.h> |
ae84e324 | 23 | #include <linux/kallsyms.h> |
34e1169d | 24 | #include <linux/file.h> |
3b5d5c6b | 25 | #include <linux/fs.h> |
6d760133 | 26 | #include <linux/sysfs.h> |
9f158333 | 27 | #include <linux/kernel.h> |
1da177e4 LT |
28 | #include <linux/slab.h> |
29 | #include <linux/vmalloc.h> | |
30 | #include <linux/elf.h> | |
3b5d5c6b | 31 | #include <linux/proc_fs.h> |
2e72d51b | 32 | #include <linux/security.h> |
1da177e4 LT |
33 | #include <linux/seq_file.h> |
34 | #include <linux/syscalls.h> | |
35 | #include <linux/fcntl.h> | |
36 | #include <linux/rcupdate.h> | |
c59ede7b | 37 | #include <linux/capability.h> |
1da177e4 LT |
38 | #include <linux/cpu.h> |
39 | #include <linux/moduleparam.h> | |
40 | #include <linux/errno.h> | |
41 | #include <linux/err.h> | |
42 | #include <linux/vermagic.h> | |
43 | #include <linux/notifier.h> | |
f6a57033 | 44 | #include <linux/sched.h> |
1da177e4 LT |
45 | #include <linux/stop_machine.h> |
46 | #include <linux/device.h> | |
c988d2b2 | 47 | #include <linux/string.h> |
97d1f15b | 48 | #include <linux/mutex.h> |
d72b3751 | 49 | #include <linux/rculist.h> |
1da177e4 | 50 | #include <asm/uaccess.h> |
1da177e4 | 51 | #include <asm/cacheflush.h> |
eb8cdec4 | 52 | #include <asm/mmu_context.h> |
b817f6fe | 53 | #include <linux/license.h> |
6d762394 | 54 | #include <asm/sections.h> |
97e1c18e | 55 | #include <linux/tracepoint.h> |
90d595fe | 56 | #include <linux/ftrace.h> |
22a9d645 | 57 | #include <linux/async.h> |
fbf59bc9 | 58 | #include <linux/percpu.h> |
4f2294b6 | 59 | #include <linux/kmemleak.h> |
bf5438fc | 60 | #include <linux/jump_label.h> |
84e1c6bb | 61 | #include <linux/pfn.h> |
403ed278 | 62 | #include <linux/bsearch.h> |
1d0059f3 | 63 | #include <linux/fips.h> |
2f3238ae | 64 | #include <uapi/linux/module.h> |
106a4ee2 | 65 | #include "module-internal.h" |
1da177e4 | 66 | |
7ead8b83 LZ |
67 | #define CREATE_TRACE_POINTS |
68 | #include <trace/events/module.h> | |
69 | ||
1da177e4 LT |
70 | #ifndef ARCH_SHF_SMALL |
71 | #define ARCH_SHF_SMALL 0 | |
72 | #endif | |
73 | ||
84e1c6bb | 74 | /* |
75 | * Modules' sections will be aligned on page boundaries | |
76 | * to ensure complete separation of code and data, but | |
77 | * only when CONFIG_DEBUG_SET_MODULE_RONX=y | |
78 | */ | |
79 | #ifdef CONFIG_DEBUG_SET_MODULE_RONX | |
80 | # define debug_align(X) ALIGN(X, PAGE_SIZE) | |
81 | #else | |
82 | # define debug_align(X) (X) | |
83 | #endif | |
84 | ||
85 | /* | |
86 | * Given BASE and SIZE this macro calculates the number of pages the | |
87 | * memory regions occupies | |
88 | */ | |
89 | #define MOD_NUMBER_OF_PAGES(BASE, SIZE) (((SIZE) > 0) ? \ | |
90 | (PFN_DOWN((unsigned long)(BASE) + (SIZE) - 1) - \ | |
91 | PFN_DOWN((unsigned long)BASE) + 1) \ | |
92 | : (0UL)) | |
93 | ||
1da177e4 LT |
94 | /* If this is set, the section belongs in the init part of the module */ |
95 | #define INIT_OFFSET_MASK (1UL << (BITS_PER_LONG-1)) | |
96 | ||
75676500 RR |
97 | /* |
98 | * Mutex protects: | |
99 | * 1) List of modules (also safely readable with preempt_disable), | |
100 | * 2) module_use links, | |
101 | * 3) module_addr_min/module_addr_max. | |
d72b3751 | 102 | * (delete uses stop_machine/add uses RCU list operations). */ |
c6b37801 TA |
103 | DEFINE_MUTEX(module_mutex); |
104 | EXPORT_SYMBOL_GPL(module_mutex); | |
1da177e4 | 105 | static LIST_HEAD(modules); |
67fc4e0c JW |
106 | #ifdef CONFIG_KGDB_KDB |
107 | struct list_head *kdb_modules = &modules; /* kdb needs the list of modules */ | |
108 | #endif /* CONFIG_KGDB_KDB */ | |
109 | ||
106a4ee2 RR |
110 | #ifdef CONFIG_MODULE_SIG |
111 | #ifdef CONFIG_MODULE_SIG_FORCE | |
112 | static bool sig_enforce = true; | |
113 | #else | |
114 | static bool sig_enforce = false; | |
115 | ||
116 | static int param_set_bool_enable_only(const char *val, | |
117 | const struct kernel_param *kp) | |
118 | { | |
119 | int err; | |
120 | bool test; | |
121 | struct kernel_param dummy_kp = *kp; | |
122 | ||
123 | dummy_kp.arg = &test; | |
124 | ||
125 | err = param_set_bool(val, &dummy_kp); | |
126 | if (err) | |
127 | return err; | |
128 | ||
129 | /* Don't let them unset it once it's set! */ | |
130 | if (!test && sig_enforce) | |
131 | return -EROFS; | |
132 | ||
133 | if (test) | |
134 | sig_enforce = true; | |
135 | return 0; | |
136 | } | |
137 | ||
138 | static const struct kernel_param_ops param_ops_bool_enable_only = { | |
139 | .set = param_set_bool_enable_only, | |
140 | .get = param_get_bool, | |
141 | }; | |
142 | #define param_check_bool_enable_only param_check_bool | |
143 | ||
144 | module_param(sig_enforce, bool_enable_only, 0644); | |
145 | #endif /* !CONFIG_MODULE_SIG_FORCE */ | |
146 | #endif /* CONFIG_MODULE_SIG */ | |
1da177e4 | 147 | |
19e4529e SR |
148 | /* Block module loading/unloading? */ |
149 | int modules_disabled = 0; | |
02608bef | 150 | core_param(nomodule, modules_disabled, bint, 0); |
19e4529e | 151 | |
c9a3ba55 RR |
152 | /* Waiting for a module to finish initializing? */ |
153 | static DECLARE_WAIT_QUEUE_HEAD(module_wq); | |
154 | ||
e041c683 | 155 | static BLOCKING_NOTIFIER_HEAD(module_notify_list); |
1da177e4 | 156 | |
75676500 RR |
157 | /* Bounds of module allocation, for speeding __module_address. |
158 | * Protected by module_mutex. */ | |
3a642e99 RR |
159 | static unsigned long module_addr_min = -1UL, module_addr_max = 0; |
160 | ||
1da177e4 LT |
161 | int register_module_notifier(struct notifier_block * nb) |
162 | { | |
e041c683 | 163 | return blocking_notifier_chain_register(&module_notify_list, nb); |
1da177e4 LT |
164 | } |
165 | EXPORT_SYMBOL(register_module_notifier); | |
166 | ||
167 | int unregister_module_notifier(struct notifier_block * nb) | |
168 | { | |
e041c683 | 169 | return blocking_notifier_chain_unregister(&module_notify_list, nb); |
1da177e4 LT |
170 | } |
171 | EXPORT_SYMBOL(unregister_module_notifier); | |
172 | ||
eded41c1 RR |
173 | struct load_info { |
174 | Elf_Ehdr *hdr; | |
175 | unsigned long len; | |
176 | Elf_Shdr *sechdrs; | |
6526c534 | 177 | char *secstrings, *strtab; |
d913188c | 178 | unsigned long symoffs, stroffs; |
811d66a0 RR |
179 | struct _ddebug *debug; |
180 | unsigned int num_debug; | |
106a4ee2 | 181 | bool sig_ok; |
eded41c1 RR |
182 | struct { |
183 | unsigned int sym, str, mod, vers, info, pcpu; | |
184 | } index; | |
185 | }; | |
186 | ||
9a4b9708 ML |
187 | /* We require a truly strong try_module_get(): 0 means failure due to |
188 | ongoing or failed initialization etc. */ | |
1da177e4 LT |
189 | static inline int strong_try_module_get(struct module *mod) |
190 | { | |
0d21b0e3 | 191 | BUG_ON(mod && mod->state == MODULE_STATE_UNFORMED); |
1da177e4 | 192 | if (mod && mod->state == MODULE_STATE_COMING) |
c9a3ba55 RR |
193 | return -EBUSY; |
194 | if (try_module_get(mod)) | |
1da177e4 | 195 | return 0; |
c9a3ba55 RR |
196 | else |
197 | return -ENOENT; | |
1da177e4 LT |
198 | } |
199 | ||
fa3ba2e8 FM |
200 | static inline void add_taint_module(struct module *mod, unsigned flag) |
201 | { | |
202 | add_taint(flag); | |
25ddbb18 | 203 | mod->taints |= (1U << flag); |
fa3ba2e8 FM |
204 | } |
205 | ||
02a3e59a RD |
206 | /* |
207 | * A thread that wants to hold a reference to a module only while it | |
208 | * is running can call this to safely exit. nfsd and lockd use this. | |
1da177e4 LT |
209 | */ |
210 | void __module_put_and_exit(struct module *mod, long code) | |
211 | { | |
212 | module_put(mod); | |
213 | do_exit(code); | |
214 | } | |
215 | EXPORT_SYMBOL(__module_put_and_exit); | |
22a8bdeb | 216 | |
1da177e4 | 217 | /* Find a module section: 0 means not found. */ |
49668688 | 218 | static unsigned int find_sec(const struct load_info *info, const char *name) |
1da177e4 LT |
219 | { |
220 | unsigned int i; | |
221 | ||
49668688 RR |
222 | for (i = 1; i < info->hdr->e_shnum; i++) { |
223 | Elf_Shdr *shdr = &info->sechdrs[i]; | |
1da177e4 | 224 | /* Alloc bit cleared means "ignore it." */ |
49668688 RR |
225 | if ((shdr->sh_flags & SHF_ALLOC) |
226 | && strcmp(info->secstrings + shdr->sh_name, name) == 0) | |
1da177e4 | 227 | return i; |
49668688 | 228 | } |
1da177e4 LT |
229 | return 0; |
230 | } | |
231 | ||
5e458cc0 | 232 | /* Find a module section, or NULL. */ |
49668688 | 233 | static void *section_addr(const struct load_info *info, const char *name) |
5e458cc0 RR |
234 | { |
235 | /* Section 0 has sh_addr 0. */ | |
49668688 | 236 | return (void *)info->sechdrs[find_sec(info, name)].sh_addr; |
5e458cc0 RR |
237 | } |
238 | ||
239 | /* Find a module section, or NULL. Fill in number of "objects" in section. */ | |
49668688 | 240 | static void *section_objs(const struct load_info *info, |
5e458cc0 RR |
241 | const char *name, |
242 | size_t object_size, | |
243 | unsigned int *num) | |
244 | { | |
49668688 | 245 | unsigned int sec = find_sec(info, name); |
5e458cc0 RR |
246 | |
247 | /* Section 0 has sh_addr 0 and sh_size 0. */ | |
49668688 RR |
248 | *num = info->sechdrs[sec].sh_size / object_size; |
249 | return (void *)info->sechdrs[sec].sh_addr; | |
5e458cc0 RR |
250 | } |
251 | ||
1da177e4 LT |
252 | /* Provided by the linker */ |
253 | extern const struct kernel_symbol __start___ksymtab[]; | |
254 | extern const struct kernel_symbol __stop___ksymtab[]; | |
255 | extern const struct kernel_symbol __start___ksymtab_gpl[]; | |
256 | extern const struct kernel_symbol __stop___ksymtab_gpl[]; | |
9f28bb7e GKH |
257 | extern const struct kernel_symbol __start___ksymtab_gpl_future[]; |
258 | extern const struct kernel_symbol __stop___ksymtab_gpl_future[]; | |
1da177e4 LT |
259 | extern const unsigned long __start___kcrctab[]; |
260 | extern const unsigned long __start___kcrctab_gpl[]; | |
9f28bb7e | 261 | extern const unsigned long __start___kcrctab_gpl_future[]; |
f7f5b675 DV |
262 | #ifdef CONFIG_UNUSED_SYMBOLS |
263 | extern const struct kernel_symbol __start___ksymtab_unused[]; | |
264 | extern const struct kernel_symbol __stop___ksymtab_unused[]; | |
265 | extern const struct kernel_symbol __start___ksymtab_unused_gpl[]; | |
266 | extern const struct kernel_symbol __stop___ksymtab_unused_gpl[]; | |
f71d20e9 AV |
267 | extern const unsigned long __start___kcrctab_unused[]; |
268 | extern const unsigned long __start___kcrctab_unused_gpl[]; | |
f7f5b675 | 269 | #endif |
1da177e4 LT |
270 | |
271 | #ifndef CONFIG_MODVERSIONS | |
272 | #define symversion(base, idx) NULL | |
273 | #else | |
f83ca9fe | 274 | #define symversion(base, idx) ((base != NULL) ? ((base) + (idx)) : NULL) |
1da177e4 LT |
275 | #endif |
276 | ||
dafd0940 RR |
277 | static bool each_symbol_in_section(const struct symsearch *arr, |
278 | unsigned int arrsize, | |
279 | struct module *owner, | |
280 | bool (*fn)(const struct symsearch *syms, | |
281 | struct module *owner, | |
de4d8d53 | 282 | void *data), |
dafd0940 | 283 | void *data) |
ad9546c9 | 284 | { |
de4d8d53 | 285 | unsigned int j; |
ad9546c9 | 286 | |
dafd0940 | 287 | for (j = 0; j < arrsize; j++) { |
de4d8d53 RR |
288 | if (fn(&arr[j], owner, data)) |
289 | return true; | |
f71d20e9 | 290 | } |
dafd0940 RR |
291 | |
292 | return false; | |
ad9546c9 RR |
293 | } |
294 | ||
dafd0940 | 295 | /* Returns true as soon as fn returns true, otherwise false. */ |
de4d8d53 RR |
296 | bool each_symbol_section(bool (*fn)(const struct symsearch *arr, |
297 | struct module *owner, | |
298 | void *data), | |
299 | void *data) | |
ad9546c9 RR |
300 | { |
301 | struct module *mod; | |
44032e63 | 302 | static const struct symsearch arr[] = { |
ad9546c9 | 303 | { __start___ksymtab, __stop___ksymtab, __start___kcrctab, |
dafd0940 | 304 | NOT_GPL_ONLY, false }, |
ad9546c9 | 305 | { __start___ksymtab_gpl, __stop___ksymtab_gpl, |
dafd0940 RR |
306 | __start___kcrctab_gpl, |
307 | GPL_ONLY, false }, | |
ad9546c9 | 308 | { __start___ksymtab_gpl_future, __stop___ksymtab_gpl_future, |
dafd0940 RR |
309 | __start___kcrctab_gpl_future, |
310 | WILL_BE_GPL_ONLY, false }, | |
f7f5b675 | 311 | #ifdef CONFIG_UNUSED_SYMBOLS |
ad9546c9 | 312 | { __start___ksymtab_unused, __stop___ksymtab_unused, |
dafd0940 RR |
313 | __start___kcrctab_unused, |
314 | NOT_GPL_ONLY, true }, | |
ad9546c9 | 315 | { __start___ksymtab_unused_gpl, __stop___ksymtab_unused_gpl, |
dafd0940 RR |
316 | __start___kcrctab_unused_gpl, |
317 | GPL_ONLY, true }, | |
f7f5b675 | 318 | #endif |
ad9546c9 | 319 | }; |
f71d20e9 | 320 | |
dafd0940 RR |
321 | if (each_symbol_in_section(arr, ARRAY_SIZE(arr), NULL, fn, data)) |
322 | return true; | |
f71d20e9 | 323 | |
d72b3751 | 324 | list_for_each_entry_rcu(mod, &modules, list) { |
ad9546c9 RR |
325 | struct symsearch arr[] = { |
326 | { mod->syms, mod->syms + mod->num_syms, mod->crcs, | |
dafd0940 | 327 | NOT_GPL_ONLY, false }, |
ad9546c9 | 328 | { mod->gpl_syms, mod->gpl_syms + mod->num_gpl_syms, |
dafd0940 RR |
329 | mod->gpl_crcs, |
330 | GPL_ONLY, false }, | |
ad9546c9 RR |
331 | { mod->gpl_future_syms, |
332 | mod->gpl_future_syms + mod->num_gpl_future_syms, | |
dafd0940 RR |
333 | mod->gpl_future_crcs, |
334 | WILL_BE_GPL_ONLY, false }, | |
f7f5b675 | 335 | #ifdef CONFIG_UNUSED_SYMBOLS |
ad9546c9 RR |
336 | { mod->unused_syms, |
337 | mod->unused_syms + mod->num_unused_syms, | |
dafd0940 RR |
338 | mod->unused_crcs, |
339 | NOT_GPL_ONLY, true }, | |
ad9546c9 RR |
340 | { mod->unused_gpl_syms, |
341 | mod->unused_gpl_syms + mod->num_unused_gpl_syms, | |
dafd0940 RR |
342 | mod->unused_gpl_crcs, |
343 | GPL_ONLY, true }, | |
f7f5b675 | 344 | #endif |
ad9546c9 RR |
345 | }; |
346 | ||
0d21b0e3 RR |
347 | if (mod->state == MODULE_STATE_UNFORMED) |
348 | continue; | |
349 | ||
dafd0940 RR |
350 | if (each_symbol_in_section(arr, ARRAY_SIZE(arr), mod, fn, data)) |
351 | return true; | |
352 | } | |
353 | return false; | |
354 | } | |
de4d8d53 | 355 | EXPORT_SYMBOL_GPL(each_symbol_section); |
dafd0940 RR |
356 | |
357 | struct find_symbol_arg { | |
358 | /* Input */ | |
359 | const char *name; | |
360 | bool gplok; | |
361 | bool warn; | |
362 | ||
363 | /* Output */ | |
364 | struct module *owner; | |
365 | const unsigned long *crc; | |
414fd31b | 366 | const struct kernel_symbol *sym; |
dafd0940 RR |
367 | }; |
368 | ||
de4d8d53 RR |
369 | static bool check_symbol(const struct symsearch *syms, |
370 | struct module *owner, | |
371 | unsigned int symnum, void *data) | |
dafd0940 RR |
372 | { |
373 | struct find_symbol_arg *fsa = data; | |
374 | ||
dafd0940 RR |
375 | if (!fsa->gplok) { |
376 | if (syms->licence == GPL_ONLY) | |
377 | return false; | |
378 | if (syms->licence == WILL_BE_GPL_ONLY && fsa->warn) { | |
379 | printk(KERN_WARNING "Symbol %s is being used " | |
380 | "by a non-GPL module, which will not " | |
381 | "be allowed in the future\n", fsa->name); | |
9f28bb7e | 382 | } |
1da177e4 | 383 | } |
ad9546c9 | 384 | |
f7f5b675 | 385 | #ifdef CONFIG_UNUSED_SYMBOLS |
dafd0940 RR |
386 | if (syms->unused && fsa->warn) { |
387 | printk(KERN_WARNING "Symbol %s is marked as UNUSED, " | |
388 | "however this module is using it.\n", fsa->name); | |
389 | printk(KERN_WARNING | |
390 | "This symbol will go away in the future.\n"); | |
391 | printk(KERN_WARNING | |
392 | "Please evalute if this is the right api to use and if " | |
393 | "it really is, submit a report the linux kernel " | |
394 | "mailinglist together with submitting your code for " | |
395 | "inclusion.\n"); | |
396 | } | |
f7f5b675 | 397 | #endif |
dafd0940 RR |
398 | |
399 | fsa->owner = owner; | |
400 | fsa->crc = symversion(syms->crcs, symnum); | |
414fd31b | 401 | fsa->sym = &syms->start[symnum]; |
dafd0940 RR |
402 | return true; |
403 | } | |
404 | ||
403ed278 AIB |
405 | static int cmp_name(const void *va, const void *vb) |
406 | { | |
407 | const char *a; | |
408 | const struct kernel_symbol *b; | |
409 | a = va; b = vb; | |
410 | return strcmp(a, b->name); | |
411 | } | |
412 | ||
de4d8d53 RR |
413 | static bool find_symbol_in_section(const struct symsearch *syms, |
414 | struct module *owner, | |
415 | void *data) | |
416 | { | |
417 | struct find_symbol_arg *fsa = data; | |
403ed278 AIB |
418 | struct kernel_symbol *sym; |
419 | ||
420 | sym = bsearch(fsa->name, syms->start, syms->stop - syms->start, | |
421 | sizeof(struct kernel_symbol), cmp_name); | |
422 | ||
423 | if (sym != NULL && check_symbol(syms, owner, sym - syms->start, data)) | |
424 | return true; | |
de4d8d53 | 425 | |
de4d8d53 RR |
426 | return false; |
427 | } | |
428 | ||
414fd31b | 429 | /* Find a symbol and return it, along with, (optional) crc and |
75676500 | 430 | * (optional) module which owns it. Needs preempt disabled or module_mutex. */ |
c6b37801 TA |
431 | const struct kernel_symbol *find_symbol(const char *name, |
432 | struct module **owner, | |
433 | const unsigned long **crc, | |
434 | bool gplok, | |
435 | bool warn) | |
dafd0940 RR |
436 | { |
437 | struct find_symbol_arg fsa; | |
438 | ||
439 | fsa.name = name; | |
440 | fsa.gplok = gplok; | |
441 | fsa.warn = warn; | |
442 | ||
de4d8d53 | 443 | if (each_symbol_section(find_symbol_in_section, &fsa)) { |
dafd0940 RR |
444 | if (owner) |
445 | *owner = fsa.owner; | |
446 | if (crc) | |
447 | *crc = fsa.crc; | |
414fd31b | 448 | return fsa.sym; |
dafd0940 RR |
449 | } |
450 | ||
5e124169 | 451 | pr_debug("Failed to find symbol %s\n", name); |
414fd31b | 452 | return NULL; |
1da177e4 | 453 | } |
c6b37801 | 454 | EXPORT_SYMBOL_GPL(find_symbol); |
1da177e4 | 455 | |
1da177e4 | 456 | /* Search for module by name: must hold module_mutex. */ |
0d21b0e3 RR |
457 | static struct module *find_module_all(const char *name, |
458 | bool even_unformed) | |
1da177e4 LT |
459 | { |
460 | struct module *mod; | |
461 | ||
462 | list_for_each_entry(mod, &modules, list) { | |
0d21b0e3 RR |
463 | if (!even_unformed && mod->state == MODULE_STATE_UNFORMED) |
464 | continue; | |
1da177e4 LT |
465 | if (strcmp(mod->name, name) == 0) |
466 | return mod; | |
467 | } | |
468 | return NULL; | |
469 | } | |
0d21b0e3 RR |
470 | |
471 | struct module *find_module(const char *name) | |
472 | { | |
473 | return find_module_all(name, false); | |
474 | } | |
c6b37801 | 475 | EXPORT_SYMBOL_GPL(find_module); |
1da177e4 LT |
476 | |
477 | #ifdef CONFIG_SMP | |
fbf59bc9 | 478 | |
259354de | 479 | static inline void __percpu *mod_percpu(struct module *mod) |
fbf59bc9 | 480 | { |
259354de TH |
481 | return mod->percpu; |
482 | } | |
fbf59bc9 | 483 | |
259354de TH |
484 | static int percpu_modalloc(struct module *mod, |
485 | unsigned long size, unsigned long align) | |
486 | { | |
fbf59bc9 TH |
487 | if (align > PAGE_SIZE) { |
488 | printk(KERN_WARNING "%s: per-cpu alignment %li > %li\n", | |
259354de | 489 | mod->name, align, PAGE_SIZE); |
fbf59bc9 TH |
490 | align = PAGE_SIZE; |
491 | } | |
492 | ||
259354de TH |
493 | mod->percpu = __alloc_reserved_percpu(size, align); |
494 | if (!mod->percpu) { | |
fbf59bc9 | 495 | printk(KERN_WARNING |
d913188c RR |
496 | "%s: Could not allocate %lu bytes percpu data\n", |
497 | mod->name, size); | |
259354de TH |
498 | return -ENOMEM; |
499 | } | |
500 | mod->percpu_size = size; | |
501 | return 0; | |
fbf59bc9 TH |
502 | } |
503 | ||
259354de | 504 | static void percpu_modfree(struct module *mod) |
fbf59bc9 | 505 | { |
259354de | 506 | free_percpu(mod->percpu); |
fbf59bc9 TH |
507 | } |
508 | ||
49668688 | 509 | static unsigned int find_pcpusec(struct load_info *info) |
6b588c18 | 510 | { |
49668688 | 511 | return find_sec(info, ".data..percpu"); |
6b588c18 TH |
512 | } |
513 | ||
259354de TH |
514 | static void percpu_modcopy(struct module *mod, |
515 | const void *from, unsigned long size) | |
6b588c18 TH |
516 | { |
517 | int cpu; | |
518 | ||
519 | for_each_possible_cpu(cpu) | |
259354de | 520 | memcpy(per_cpu_ptr(mod->percpu, cpu), from, size); |
6b588c18 TH |
521 | } |
522 | ||
10fad5e4 TH |
523 | /** |
524 | * is_module_percpu_address - test whether address is from module static percpu | |
525 | * @addr: address to test | |
526 | * | |
527 | * Test whether @addr belongs to module static percpu area. | |
528 | * | |
529 | * RETURNS: | |
530 | * %true if @addr is from module static percpu area | |
531 | */ | |
532 | bool is_module_percpu_address(unsigned long addr) | |
533 | { | |
534 | struct module *mod; | |
535 | unsigned int cpu; | |
536 | ||
537 | preempt_disable(); | |
538 | ||
539 | list_for_each_entry_rcu(mod, &modules, list) { | |
0d21b0e3 RR |
540 | if (mod->state == MODULE_STATE_UNFORMED) |
541 | continue; | |
10fad5e4 TH |
542 | if (!mod->percpu_size) |
543 | continue; | |
544 | for_each_possible_cpu(cpu) { | |
545 | void *start = per_cpu_ptr(mod->percpu, cpu); | |
546 | ||
547 | if ((void *)addr >= start && | |
548 | (void *)addr < start + mod->percpu_size) { | |
549 | preempt_enable(); | |
550 | return true; | |
551 | } | |
552 | } | |
553 | } | |
554 | ||
555 | preempt_enable(); | |
556 | return false; | |
6b588c18 TH |
557 | } |
558 | ||
1da177e4 | 559 | #else /* ... !CONFIG_SMP */ |
6b588c18 | 560 | |
259354de | 561 | static inline void __percpu *mod_percpu(struct module *mod) |
1da177e4 LT |
562 | { |
563 | return NULL; | |
564 | } | |
259354de TH |
565 | static inline int percpu_modalloc(struct module *mod, |
566 | unsigned long size, unsigned long align) | |
567 | { | |
568 | return -ENOMEM; | |
569 | } | |
570 | static inline void percpu_modfree(struct module *mod) | |
1da177e4 | 571 | { |
1da177e4 | 572 | } |
49668688 | 573 | static unsigned int find_pcpusec(struct load_info *info) |
1da177e4 LT |
574 | { |
575 | return 0; | |
576 | } | |
259354de TH |
577 | static inline void percpu_modcopy(struct module *mod, |
578 | const void *from, unsigned long size) | |
1da177e4 LT |
579 | { |
580 | /* pcpusec should be 0, and size of that section should be 0. */ | |
581 | BUG_ON(size != 0); | |
582 | } | |
10fad5e4 TH |
583 | bool is_module_percpu_address(unsigned long addr) |
584 | { | |
585 | return false; | |
586 | } | |
6b588c18 | 587 | |
1da177e4 LT |
588 | #endif /* CONFIG_SMP */ |
589 | ||
c988d2b2 MD |
590 | #define MODINFO_ATTR(field) \ |
591 | static void setup_modinfo_##field(struct module *mod, const char *s) \ | |
592 | { \ | |
593 | mod->field = kstrdup(s, GFP_KERNEL); \ | |
594 | } \ | |
595 | static ssize_t show_modinfo_##field(struct module_attribute *mattr, \ | |
4befb026 | 596 | struct module_kobject *mk, char *buffer) \ |
c988d2b2 | 597 | { \ |
4befb026 | 598 | return sprintf(buffer, "%s\n", mk->mod->field); \ |
c988d2b2 MD |
599 | } \ |
600 | static int modinfo_##field##_exists(struct module *mod) \ | |
601 | { \ | |
602 | return mod->field != NULL; \ | |
603 | } \ | |
604 | static void free_modinfo_##field(struct module *mod) \ | |
605 | { \ | |
22a8bdeb DW |
606 | kfree(mod->field); \ |
607 | mod->field = NULL; \ | |
c988d2b2 MD |
608 | } \ |
609 | static struct module_attribute modinfo_##field = { \ | |
7b595756 | 610 | .attr = { .name = __stringify(field), .mode = 0444 }, \ |
c988d2b2 MD |
611 | .show = show_modinfo_##field, \ |
612 | .setup = setup_modinfo_##field, \ | |
613 | .test = modinfo_##field##_exists, \ | |
614 | .free = free_modinfo_##field, \ | |
615 | }; | |
616 | ||
617 | MODINFO_ATTR(version); | |
618 | MODINFO_ATTR(srcversion); | |
619 | ||
e14af7ee AV |
620 | static char last_unloaded_module[MODULE_NAME_LEN+1]; |
621 | ||
03e88ae1 | 622 | #ifdef CONFIG_MODULE_UNLOAD |
eb0c5377 SR |
623 | |
624 | EXPORT_TRACEPOINT_SYMBOL(module_get); | |
625 | ||
1da177e4 | 626 | /* Init the unload section of the module. */ |
9f85a4bb | 627 | static int module_unload_init(struct module *mod) |
1da177e4 | 628 | { |
9f85a4bb RR |
629 | mod->refptr = alloc_percpu(struct module_ref); |
630 | if (!mod->refptr) | |
631 | return -ENOMEM; | |
632 | ||
2c02dfe7 LT |
633 | INIT_LIST_HEAD(&mod->source_list); |
634 | INIT_LIST_HEAD(&mod->target_list); | |
e1783a24 | 635 | |
1da177e4 | 636 | /* Hold reference count during initialization. */ |
5fbfb18d | 637 | __this_cpu_write(mod->refptr->incs, 1); |
1da177e4 LT |
638 | /* Backwards compatibility macros put refcount during init. */ |
639 | mod->waiter = current; | |
9f85a4bb RR |
640 | |
641 | return 0; | |
1da177e4 LT |
642 | } |
643 | ||
1da177e4 LT |
644 | /* Does a already use b? */ |
645 | static int already_uses(struct module *a, struct module *b) | |
646 | { | |
647 | struct module_use *use; | |
648 | ||
2c02dfe7 LT |
649 | list_for_each_entry(use, &b->source_list, source_list) { |
650 | if (use->source == a) { | |
5e124169 | 651 | pr_debug("%s uses %s!\n", a->name, b->name); |
1da177e4 LT |
652 | return 1; |
653 | } | |
654 | } | |
5e124169 | 655 | pr_debug("%s does not use %s!\n", a->name, b->name); |
1da177e4 LT |
656 | return 0; |
657 | } | |
658 | ||
2c02dfe7 LT |
659 | /* |
660 | * Module a uses b | |
661 | * - we add 'a' as a "source", 'b' as a "target" of module use | |
662 | * - the module_use is added to the list of 'b' sources (so | |
663 | * 'b' can walk the list to see who sourced them), and of 'a' | |
664 | * targets (so 'a' can see what modules it targets). | |
665 | */ | |
666 | static int add_module_usage(struct module *a, struct module *b) | |
667 | { | |
2c02dfe7 LT |
668 | struct module_use *use; |
669 | ||
5e124169 | 670 | pr_debug("Allocating new usage for %s.\n", a->name); |
2c02dfe7 LT |
671 | use = kmalloc(sizeof(*use), GFP_ATOMIC); |
672 | if (!use) { | |
673 | printk(KERN_WARNING "%s: out of memory loading\n", a->name); | |
674 | return -ENOMEM; | |
675 | } | |
676 | ||
677 | use->source = a; | |
678 | use->target = b; | |
679 | list_add(&use->source_list, &b->source_list); | |
680 | list_add(&use->target_list, &a->target_list); | |
2c02dfe7 LT |
681 | return 0; |
682 | } | |
683 | ||
75676500 | 684 | /* Module a uses b: caller needs module_mutex() */ |
9bea7f23 | 685 | int ref_module(struct module *a, struct module *b) |
1da177e4 | 686 | { |
c8e21ced | 687 | int err; |
270a6c4c | 688 | |
9bea7f23 | 689 | if (b == NULL || already_uses(a, b)) |
218ce735 | 690 | return 0; |
218ce735 | 691 | |
9bea7f23 RR |
692 | /* If module isn't available, we fail. */ |
693 | err = strong_try_module_get(b); | |
c9a3ba55 | 694 | if (err) |
9bea7f23 | 695 | return err; |
1da177e4 | 696 | |
2c02dfe7 LT |
697 | err = add_module_usage(a, b); |
698 | if (err) { | |
1da177e4 | 699 | module_put(b); |
9bea7f23 | 700 | return err; |
1da177e4 | 701 | } |
9bea7f23 | 702 | return 0; |
1da177e4 | 703 | } |
9bea7f23 | 704 | EXPORT_SYMBOL_GPL(ref_module); |
1da177e4 LT |
705 | |
706 | /* Clear the unload stuff of the module. */ | |
707 | static void module_unload_free(struct module *mod) | |
708 | { | |
2c02dfe7 | 709 | struct module_use *use, *tmp; |
1da177e4 | 710 | |
75676500 | 711 | mutex_lock(&module_mutex); |
2c02dfe7 LT |
712 | list_for_each_entry_safe(use, tmp, &mod->target_list, target_list) { |
713 | struct module *i = use->target; | |
5e124169 | 714 | pr_debug("%s unusing %s\n", mod->name, i->name); |
2c02dfe7 LT |
715 | module_put(i); |
716 | list_del(&use->source_list); | |
717 | list_del(&use->target_list); | |
718 | kfree(use); | |
1da177e4 | 719 | } |
75676500 | 720 | mutex_unlock(&module_mutex); |
9f85a4bb RR |
721 | |
722 | free_percpu(mod->refptr); | |
1da177e4 LT |
723 | } |
724 | ||
725 | #ifdef CONFIG_MODULE_FORCE_UNLOAD | |
fb169793 | 726 | static inline int try_force_unload(unsigned int flags) |
1da177e4 LT |
727 | { |
728 | int ret = (flags & O_TRUNC); | |
729 | if (ret) | |
fb169793 | 730 | add_taint(TAINT_FORCED_RMMOD); |
1da177e4 LT |
731 | return ret; |
732 | } | |
733 | #else | |
fb169793 | 734 | static inline int try_force_unload(unsigned int flags) |
1da177e4 LT |
735 | { |
736 | return 0; | |
737 | } | |
738 | #endif /* CONFIG_MODULE_FORCE_UNLOAD */ | |
739 | ||
740 | struct stopref | |
741 | { | |
742 | struct module *mod; | |
743 | int flags; | |
744 | int *forced; | |
745 | }; | |
746 | ||
747 | /* Whole machine is stopped with interrupts off when this runs. */ | |
748 | static int __try_stop_module(void *_sref) | |
749 | { | |
750 | struct stopref *sref = _sref; | |
751 | ||
da39ba5e RR |
752 | /* If it's not unused, quit unless we're forcing. */ |
753 | if (module_refcount(sref->mod) != 0) { | |
fb169793 | 754 | if (!(*sref->forced = try_force_unload(sref->flags))) |
1da177e4 LT |
755 | return -EWOULDBLOCK; |
756 | } | |
757 | ||
758 | /* Mark it as dying. */ | |
759 | sref->mod->state = MODULE_STATE_GOING; | |
760 | return 0; | |
761 | } | |
762 | ||
763 | static int try_stop_module(struct module *mod, int flags, int *forced) | |
764 | { | |
da39ba5e RR |
765 | if (flags & O_NONBLOCK) { |
766 | struct stopref sref = { mod, flags, forced }; | |
1da177e4 | 767 | |
9b1a4d38 | 768 | return stop_machine(__try_stop_module, &sref, NULL); |
da39ba5e RR |
769 | } else { |
770 | /* We don't need to stop the machine for this. */ | |
771 | mod->state = MODULE_STATE_GOING; | |
772 | synchronize_sched(); | |
773 | return 0; | |
774 | } | |
1da177e4 LT |
775 | } |
776 | ||
bd77c047 | 777 | unsigned long module_refcount(struct module *mod) |
1da177e4 | 778 | { |
bd77c047 | 779 | unsigned long incs = 0, decs = 0; |
720eba31 | 780 | int cpu; |
1da177e4 | 781 | |
720eba31 | 782 | for_each_possible_cpu(cpu) |
5fbfb18d NP |
783 | decs += per_cpu_ptr(mod->refptr, cpu)->decs; |
784 | /* | |
785 | * ensure the incs are added up after the decs. | |
786 | * module_put ensures incs are visible before decs with smp_wmb. | |
787 | * | |
788 | * This 2-count scheme avoids the situation where the refcount | |
789 | * for CPU0 is read, then CPU0 increments the module refcount, | |
790 | * then CPU1 drops that refcount, then the refcount for CPU1 is | |
791 | * read. We would record a decrement but not its corresponding | |
792 | * increment so we would see a low count (disaster). | |
793 | * | |
794 | * Rare situation? But module_refcount can be preempted, and we | |
795 | * might be tallying up 4096+ CPUs. So it is not impossible. | |
796 | */ | |
797 | smp_rmb(); | |
798 | for_each_possible_cpu(cpu) | |
799 | incs += per_cpu_ptr(mod->refptr, cpu)->incs; | |
800 | return incs - decs; | |
1da177e4 LT |
801 | } |
802 | EXPORT_SYMBOL(module_refcount); | |
803 | ||
804 | /* This exists whether we can unload or not */ | |
805 | static void free_module(struct module *mod); | |
806 | ||
807 | static void wait_for_zero_refcount(struct module *mod) | |
808 | { | |
a6550207 | 809 | /* Since we might sleep for some time, release the mutex first */ |
6389a385 | 810 | mutex_unlock(&module_mutex); |
1da177e4 | 811 | for (;;) { |
5e124169 | 812 | pr_debug("Looking at refcount...\n"); |
1da177e4 LT |
813 | set_current_state(TASK_UNINTERRUPTIBLE); |
814 | if (module_refcount(mod) == 0) | |
815 | break; | |
816 | schedule(); | |
817 | } | |
818 | current->state = TASK_RUNNING; | |
6389a385 | 819 | mutex_lock(&module_mutex); |
1da177e4 LT |
820 | } |
821 | ||
17da2bd9 HC |
822 | SYSCALL_DEFINE2(delete_module, const char __user *, name_user, |
823 | unsigned int, flags) | |
1da177e4 LT |
824 | { |
825 | struct module *mod; | |
dfff0a06 | 826 | char name[MODULE_NAME_LEN]; |
1da177e4 LT |
827 | int ret, forced = 0; |
828 | ||
3d43321b | 829 | if (!capable(CAP_SYS_MODULE) || modules_disabled) |
dfff0a06 GKH |
830 | return -EPERM; |
831 | ||
832 | if (strncpy_from_user(name, name_user, MODULE_NAME_LEN-1) < 0) | |
833 | return -EFAULT; | |
834 | name[MODULE_NAME_LEN-1] = '\0'; | |
835 | ||
3fc1f1e2 TH |
836 | if (mutex_lock_interruptible(&module_mutex) != 0) |
837 | return -EINTR; | |
1da177e4 LT |
838 | |
839 | mod = find_module(name); | |
840 | if (!mod) { | |
841 | ret = -ENOENT; | |
842 | goto out; | |
843 | } | |
844 | ||
2c02dfe7 | 845 | if (!list_empty(&mod->source_list)) { |
1da177e4 LT |
846 | /* Other modules depend on us: get rid of them first. */ |
847 | ret = -EWOULDBLOCK; | |
848 | goto out; | |
849 | } | |
850 | ||
851 | /* Doing init or already dying? */ | |
852 | if (mod->state != MODULE_STATE_LIVE) { | |
853 | /* FIXME: if (force), slam module count and wake up | |
854 | waiter --RR */ | |
5e124169 | 855 | pr_debug("%s already dying\n", mod->name); |
1da177e4 LT |
856 | ret = -EBUSY; |
857 | goto out; | |
858 | } | |
859 | ||
860 | /* If it has an init func, it must have an exit func to unload */ | |
af49d924 | 861 | if (mod->init && !mod->exit) { |
fb169793 | 862 | forced = try_force_unload(flags); |
1da177e4 LT |
863 | if (!forced) { |
864 | /* This module can't be removed */ | |
865 | ret = -EBUSY; | |
866 | goto out; | |
867 | } | |
868 | } | |
869 | ||
870 | /* Set this up before setting mod->state */ | |
871 | mod->waiter = current; | |
872 | ||
873 | /* Stop the machine so refcounts can't move and disable module. */ | |
874 | ret = try_stop_module(mod, flags, &forced); | |
875 | if (ret != 0) | |
876 | goto out; | |
877 | ||
878 | /* Never wait if forced. */ | |
879 | if (!forced && module_refcount(mod) != 0) | |
880 | wait_for_zero_refcount(mod); | |
881 | ||
df4b565e | 882 | mutex_unlock(&module_mutex); |
25985edc | 883 | /* Final destruction now no one is using it. */ |
df4b565e | 884 | if (mod->exit != NULL) |
1da177e4 | 885 | mod->exit(); |
df4b565e PO |
886 | blocking_notifier_call_chain(&module_notify_list, |
887 | MODULE_STATE_GOING, mod); | |
22a9d645 | 888 | async_synchronize_full(); |
75676500 | 889 | |
e14af7ee | 890 | /* Store the name of the last unloaded module for diagnostic purposes */ |
efa5345e | 891 | strlcpy(last_unloaded_module, mod->name, sizeof(last_unloaded_module)); |
1da177e4 | 892 | |
75676500 RR |
893 | free_module(mod); |
894 | return 0; | |
895 | out: | |
6389a385 | 896 | mutex_unlock(&module_mutex); |
1da177e4 LT |
897 | return ret; |
898 | } | |
899 | ||
d1e99d7a | 900 | static inline void print_unload_info(struct seq_file *m, struct module *mod) |
1da177e4 LT |
901 | { |
902 | struct module_use *use; | |
903 | int printed_something = 0; | |
904 | ||
bd77c047 | 905 | seq_printf(m, " %lu ", module_refcount(mod)); |
1da177e4 LT |
906 | |
907 | /* Always include a trailing , so userspace can differentiate | |
908 | between this and the old multi-field proc format. */ | |
2c02dfe7 | 909 | list_for_each_entry(use, &mod->source_list, source_list) { |
1da177e4 | 910 | printed_something = 1; |
2c02dfe7 | 911 | seq_printf(m, "%s,", use->source->name); |
1da177e4 LT |
912 | } |
913 | ||
1da177e4 LT |
914 | if (mod->init != NULL && mod->exit == NULL) { |
915 | printed_something = 1; | |
916 | seq_printf(m, "[permanent],"); | |
917 | } | |
918 | ||
919 | if (!printed_something) | |
920 | seq_printf(m, "-"); | |
921 | } | |
922 | ||
923 | void __symbol_put(const char *symbol) | |
924 | { | |
925 | struct module *owner; | |
1da177e4 | 926 | |
24da1cbf | 927 | preempt_disable(); |
414fd31b | 928 | if (!find_symbol(symbol, &owner, NULL, true, false)) |
1da177e4 LT |
929 | BUG(); |
930 | module_put(owner); | |
24da1cbf | 931 | preempt_enable(); |
1da177e4 LT |
932 | } |
933 | EXPORT_SYMBOL(__symbol_put); | |
934 | ||
7d1d16e4 | 935 | /* Note this assumes addr is a function, which it currently always is. */ |
1da177e4 LT |
936 | void symbol_put_addr(void *addr) |
937 | { | |
5e376613 | 938 | struct module *modaddr; |
7d1d16e4 | 939 | unsigned long a = (unsigned long)dereference_function_descriptor(addr); |
1da177e4 | 940 | |
7d1d16e4 | 941 | if (core_kernel_text(a)) |
5e376613 | 942 | return; |
1da177e4 | 943 | |
a6e6abd5 RR |
944 | /* module_text_address is safe here: we're supposed to have reference |
945 | * to module from symbol_get, so it can't go away. */ | |
7d1d16e4 | 946 | modaddr = __module_text_address(a); |
a6e6abd5 | 947 | BUG_ON(!modaddr); |
5e376613 | 948 | module_put(modaddr); |
1da177e4 LT |
949 | } |
950 | EXPORT_SYMBOL_GPL(symbol_put_addr); | |
951 | ||
952 | static ssize_t show_refcnt(struct module_attribute *mattr, | |
4befb026 | 953 | struct module_kobject *mk, char *buffer) |
1da177e4 | 954 | { |
bd77c047 | 955 | return sprintf(buffer, "%lu\n", module_refcount(mk->mod)); |
1da177e4 LT |
956 | } |
957 | ||
cca3e707 KS |
958 | static struct module_attribute modinfo_refcnt = |
959 | __ATTR(refcnt, 0444, show_refcnt, NULL); | |
1da177e4 | 960 | |
d53799be SR |
961 | void __module_get(struct module *module) |
962 | { | |
963 | if (module) { | |
964 | preempt_disable(); | |
965 | __this_cpu_inc(module->refptr->incs); | |
966 | trace_module_get(module, _RET_IP_); | |
967 | preempt_enable(); | |
968 | } | |
969 | } | |
970 | EXPORT_SYMBOL(__module_get); | |
971 | ||
972 | bool try_module_get(struct module *module) | |
973 | { | |
974 | bool ret = true; | |
975 | ||
976 | if (module) { | |
977 | preempt_disable(); | |
978 | ||
979 | if (likely(module_is_live(module))) { | |
980 | __this_cpu_inc(module->refptr->incs); | |
981 | trace_module_get(module, _RET_IP_); | |
982 | } else | |
983 | ret = false; | |
984 | ||
985 | preempt_enable(); | |
986 | } | |
987 | return ret; | |
988 | } | |
989 | EXPORT_SYMBOL(try_module_get); | |
990 | ||
f6a57033 AV |
991 | void module_put(struct module *module) |
992 | { | |
993 | if (module) { | |
e1783a24 | 994 | preempt_disable(); |
5fbfb18d NP |
995 | smp_wmb(); /* see comment in module_refcount */ |
996 | __this_cpu_inc(module->refptr->decs); | |
e1783a24 | 997 | |
ae832d1e | 998 | trace_module_put(module, _RET_IP_); |
f6a57033 AV |
999 | /* Maybe they're waiting for us to drop reference? */ |
1000 | if (unlikely(!module_is_live(module))) | |
1001 | wake_up_process(module->waiter); | |
e1783a24 | 1002 | preempt_enable(); |
f6a57033 AV |
1003 | } |
1004 | } | |
1005 | EXPORT_SYMBOL(module_put); | |
1006 | ||
1da177e4 | 1007 | #else /* !CONFIG_MODULE_UNLOAD */ |
d1e99d7a | 1008 | static inline void print_unload_info(struct seq_file *m, struct module *mod) |
1da177e4 LT |
1009 | { |
1010 | /* We don't know the usage count, or what modules are using. */ | |
1011 | seq_printf(m, " - -"); | |
1012 | } | |
1013 | ||
1014 | static inline void module_unload_free(struct module *mod) | |
1015 | { | |
1016 | } | |
1017 | ||
9bea7f23 | 1018 | int ref_module(struct module *a, struct module *b) |
1da177e4 | 1019 | { |
9bea7f23 | 1020 | return strong_try_module_get(b); |
1da177e4 | 1021 | } |
9bea7f23 | 1022 | EXPORT_SYMBOL_GPL(ref_module); |
1da177e4 | 1023 | |
9f85a4bb | 1024 | static inline int module_unload_init(struct module *mod) |
1da177e4 | 1025 | { |
9f85a4bb | 1026 | return 0; |
1da177e4 LT |
1027 | } |
1028 | #endif /* CONFIG_MODULE_UNLOAD */ | |
1029 | ||
53999bf3 KW |
1030 | static size_t module_flags_taint(struct module *mod, char *buf) |
1031 | { | |
1032 | size_t l = 0; | |
1033 | ||
1034 | if (mod->taints & (1 << TAINT_PROPRIETARY_MODULE)) | |
1035 | buf[l++] = 'P'; | |
1036 | if (mod->taints & (1 << TAINT_OOT_MODULE)) | |
1037 | buf[l++] = 'O'; | |
1038 | if (mod->taints & (1 << TAINT_FORCED_MODULE)) | |
1039 | buf[l++] = 'F'; | |
1040 | if (mod->taints & (1 << TAINT_CRAP)) | |
1041 | buf[l++] = 'C'; | |
1042 | /* | |
1043 | * TAINT_FORCED_RMMOD: could be added. | |
1044 | * TAINT_UNSAFE_SMP, TAINT_MACHINE_CHECK, TAINT_BAD_PAGE don't | |
1045 | * apply to modules. | |
1046 | */ | |
1047 | return l; | |
1048 | } | |
1049 | ||
1f71740a | 1050 | static ssize_t show_initstate(struct module_attribute *mattr, |
4befb026 | 1051 | struct module_kobject *mk, char *buffer) |
1f71740a KS |
1052 | { |
1053 | const char *state = "unknown"; | |
1054 | ||
4befb026 | 1055 | switch (mk->mod->state) { |
1f71740a KS |
1056 | case MODULE_STATE_LIVE: |
1057 | state = "live"; | |
1058 | break; | |
1059 | case MODULE_STATE_COMING: | |
1060 | state = "coming"; | |
1061 | break; | |
1062 | case MODULE_STATE_GOING: | |
1063 | state = "going"; | |
1064 | break; | |
0d21b0e3 RR |
1065 | default: |
1066 | BUG(); | |
1f71740a KS |
1067 | } |
1068 | return sprintf(buffer, "%s\n", state); | |
1069 | } | |
1070 | ||
cca3e707 KS |
1071 | static struct module_attribute modinfo_initstate = |
1072 | __ATTR(initstate, 0444, show_initstate, NULL); | |
1f71740a | 1073 | |
88bfa324 KS |
1074 | static ssize_t store_uevent(struct module_attribute *mattr, |
1075 | struct module_kobject *mk, | |
1076 | const char *buffer, size_t count) | |
1077 | { | |
1078 | enum kobject_action action; | |
1079 | ||
1080 | if (kobject_action_type(buffer, count, &action) == 0) | |
1081 | kobject_uevent(&mk->kobj, action); | |
1082 | return count; | |
1083 | } | |
1084 | ||
cca3e707 KS |
1085 | struct module_attribute module_uevent = |
1086 | __ATTR(uevent, 0200, NULL, store_uevent); | |
1087 | ||
1088 | static ssize_t show_coresize(struct module_attribute *mattr, | |
1089 | struct module_kobject *mk, char *buffer) | |
1090 | { | |
1091 | return sprintf(buffer, "%u\n", mk->mod->core_size); | |
1092 | } | |
1093 | ||
1094 | static struct module_attribute modinfo_coresize = | |
1095 | __ATTR(coresize, 0444, show_coresize, NULL); | |
1096 | ||
1097 | static ssize_t show_initsize(struct module_attribute *mattr, | |
1098 | struct module_kobject *mk, char *buffer) | |
1099 | { | |
1100 | return sprintf(buffer, "%u\n", mk->mod->init_size); | |
1101 | } | |
1102 | ||
1103 | static struct module_attribute modinfo_initsize = | |
1104 | __ATTR(initsize, 0444, show_initsize, NULL); | |
1105 | ||
1106 | static ssize_t show_taint(struct module_attribute *mattr, | |
1107 | struct module_kobject *mk, char *buffer) | |
1108 | { | |
1109 | size_t l; | |
1110 | ||
1111 | l = module_flags_taint(mk->mod, buffer); | |
1112 | buffer[l++] = '\n'; | |
1113 | return l; | |
1114 | } | |
1115 | ||
1116 | static struct module_attribute modinfo_taint = | |
1117 | __ATTR(taint, 0444, show_taint, NULL); | |
88bfa324 | 1118 | |
03e88ae1 | 1119 | static struct module_attribute *modinfo_attrs[] = { |
cca3e707 | 1120 | &module_uevent, |
03e88ae1 GKH |
1121 | &modinfo_version, |
1122 | &modinfo_srcversion, | |
cca3e707 KS |
1123 | &modinfo_initstate, |
1124 | &modinfo_coresize, | |
1125 | &modinfo_initsize, | |
1126 | &modinfo_taint, | |
03e88ae1 | 1127 | #ifdef CONFIG_MODULE_UNLOAD |
cca3e707 | 1128 | &modinfo_refcnt, |
03e88ae1 GKH |
1129 | #endif |
1130 | NULL, | |
1131 | }; | |
1132 | ||
1da177e4 LT |
1133 | static const char vermagic[] = VERMAGIC_STRING; |
1134 | ||
c6e665c8 | 1135 | static int try_to_force_load(struct module *mod, const char *reason) |
826e4506 LT |
1136 | { |
1137 | #ifdef CONFIG_MODULE_FORCE_LOAD | |
25ddbb18 | 1138 | if (!test_taint(TAINT_FORCED_MODULE)) |
c6e665c8 RR |
1139 | printk(KERN_WARNING "%s: %s: kernel tainted.\n", |
1140 | mod->name, reason); | |
826e4506 LT |
1141 | add_taint_module(mod, TAINT_FORCED_MODULE); |
1142 | return 0; | |
1143 | #else | |
1144 | return -ENOEXEC; | |
1145 | #endif | |
1146 | } | |
1147 | ||
1da177e4 | 1148 | #ifdef CONFIG_MODVERSIONS |
d4703aef RR |
1149 | /* If the arch applies (non-zero) relocations to kernel kcrctab, unapply it. */ |
1150 | static unsigned long maybe_relocated(unsigned long crc, | |
1151 | const struct module *crc_owner) | |
1152 | { | |
1153 | #ifdef ARCH_RELOCATES_KCRCTAB | |
1154 | if (crc_owner == NULL) | |
1155 | return crc - (unsigned long)reloc_start; | |
1156 | #endif | |
1157 | return crc; | |
1158 | } | |
1159 | ||
1da177e4 LT |
1160 | static int check_version(Elf_Shdr *sechdrs, |
1161 | unsigned int versindex, | |
1162 | const char *symname, | |
1163 | struct module *mod, | |
d4703aef RR |
1164 | const unsigned long *crc, |
1165 | const struct module *crc_owner) | |
1da177e4 LT |
1166 | { |
1167 | unsigned int i, num_versions; | |
1168 | struct modversion_info *versions; | |
1169 | ||
1170 | /* Exporting module didn't supply crcs? OK, we're already tainted. */ | |
1171 | if (!crc) | |
1172 | return 1; | |
1173 | ||
a5dd6970 RR |
1174 | /* No versions at all? modprobe --force does this. */ |
1175 | if (versindex == 0) | |
1176 | return try_to_force_load(mod, symname) == 0; | |
1177 | ||
1da177e4 LT |
1178 | versions = (void *) sechdrs[versindex].sh_addr; |
1179 | num_versions = sechdrs[versindex].sh_size | |
1180 | / sizeof(struct modversion_info); | |
1181 | ||
1182 | for (i = 0; i < num_versions; i++) { | |
1183 | if (strcmp(versions[i].name, symname) != 0) | |
1184 | continue; | |
1185 | ||
d4703aef | 1186 | if (versions[i].crc == maybe_relocated(*crc, crc_owner)) |
1da177e4 | 1187 | return 1; |
5e124169 | 1188 | pr_debug("Found checksum %lX vs module %lX\n", |
d4703aef | 1189 | maybe_relocated(*crc, crc_owner), versions[i].crc); |
826e4506 | 1190 | goto bad_version; |
1da177e4 | 1191 | } |
826e4506 | 1192 | |
a5dd6970 RR |
1193 | printk(KERN_WARNING "%s: no symbol version for %s\n", |
1194 | mod->name, symname); | |
1195 | return 0; | |
826e4506 LT |
1196 | |
1197 | bad_version: | |
1198 | printk("%s: disagrees about version of symbol %s\n", | |
1199 | mod->name, symname); | |
1200 | return 0; | |
1da177e4 LT |
1201 | } |
1202 | ||
1203 | static inline int check_modstruct_version(Elf_Shdr *sechdrs, | |
1204 | unsigned int versindex, | |
1205 | struct module *mod) | |
1206 | { | |
1207 | const unsigned long *crc; | |
1da177e4 | 1208 | |
75676500 RR |
1209 | /* Since this should be found in kernel (which can't be removed), |
1210 | * no locking is necessary. */ | |
6560dc16 MF |
1211 | if (!find_symbol(MODULE_SYMBOL_PREFIX "module_layout", NULL, |
1212 | &crc, true, false)) | |
1da177e4 | 1213 | BUG(); |
d4703aef RR |
1214 | return check_version(sechdrs, versindex, "module_layout", mod, crc, |
1215 | NULL); | |
1da177e4 LT |
1216 | } |
1217 | ||
91e37a79 RR |
1218 | /* First part is kernel version, which we ignore if module has crcs. */ |
1219 | static inline int same_magic(const char *amagic, const char *bmagic, | |
1220 | bool has_crcs) | |
1da177e4 | 1221 | { |
91e37a79 RR |
1222 | if (has_crcs) { |
1223 | amagic += strcspn(amagic, " "); | |
1224 | bmagic += strcspn(bmagic, " "); | |
1225 | } | |
1da177e4 LT |
1226 | return strcmp(amagic, bmagic) == 0; |
1227 | } | |
1228 | #else | |
1229 | static inline int check_version(Elf_Shdr *sechdrs, | |
1230 | unsigned int versindex, | |
1231 | const char *symname, | |
1232 | struct module *mod, | |
d4703aef RR |
1233 | const unsigned long *crc, |
1234 | const struct module *crc_owner) | |
1da177e4 LT |
1235 | { |
1236 | return 1; | |
1237 | } | |
1238 | ||
1239 | static inline int check_modstruct_version(Elf_Shdr *sechdrs, | |
1240 | unsigned int versindex, | |
1241 | struct module *mod) | |
1242 | { | |
1243 | return 1; | |
1244 | } | |
1245 | ||
91e37a79 RR |
1246 | static inline int same_magic(const char *amagic, const char *bmagic, |
1247 | bool has_crcs) | |
1da177e4 LT |
1248 | { |
1249 | return strcmp(amagic, bmagic) == 0; | |
1250 | } | |
1251 | #endif /* CONFIG_MODVERSIONS */ | |
1252 | ||
75676500 | 1253 | /* Resolve a symbol for this module. I.e. if we find one, record usage. */ |
49668688 RR |
1254 | static const struct kernel_symbol *resolve_symbol(struct module *mod, |
1255 | const struct load_info *info, | |
414fd31b | 1256 | const char *name, |
9bea7f23 | 1257 | char ownername[]) |
1da177e4 LT |
1258 | { |
1259 | struct module *owner; | |
414fd31b | 1260 | const struct kernel_symbol *sym; |
1da177e4 | 1261 | const unsigned long *crc; |
9bea7f23 | 1262 | int err; |
1da177e4 | 1263 | |
75676500 | 1264 | mutex_lock(&module_mutex); |
414fd31b | 1265 | sym = find_symbol(name, &owner, &crc, |
25ddbb18 | 1266 | !(mod->taints & (1 << TAINT_PROPRIETARY_MODULE)), true); |
9bea7f23 RR |
1267 | if (!sym) |
1268 | goto unlock; | |
1269 | ||
49668688 RR |
1270 | if (!check_version(info->sechdrs, info->index.vers, name, mod, crc, |
1271 | owner)) { | |
9bea7f23 RR |
1272 | sym = ERR_PTR(-EINVAL); |
1273 | goto getname; | |
1da177e4 | 1274 | } |
9bea7f23 RR |
1275 | |
1276 | err = ref_module(mod, owner); | |
1277 | if (err) { | |
1278 | sym = ERR_PTR(err); | |
1279 | goto getname; | |
1280 | } | |
1281 | ||
1282 | getname: | |
1283 | /* We must make copy under the lock if we failed to get ref. */ | |
1284 | strncpy(ownername, module_name(owner), MODULE_NAME_LEN); | |
1285 | unlock: | |
75676500 | 1286 | mutex_unlock(&module_mutex); |
218ce735 | 1287 | return sym; |
1da177e4 LT |
1288 | } |
1289 | ||
49668688 RR |
1290 | static const struct kernel_symbol * |
1291 | resolve_symbol_wait(struct module *mod, | |
1292 | const struct load_info *info, | |
1293 | const char *name) | |
9bea7f23 RR |
1294 | { |
1295 | const struct kernel_symbol *ksym; | |
49668688 | 1296 | char owner[MODULE_NAME_LEN]; |
9bea7f23 RR |
1297 | |
1298 | if (wait_event_interruptible_timeout(module_wq, | |
49668688 RR |
1299 | !IS_ERR(ksym = resolve_symbol(mod, info, name, owner)) |
1300 | || PTR_ERR(ksym) != -EBUSY, | |
9bea7f23 RR |
1301 | 30 * HZ) <= 0) { |
1302 | printk(KERN_WARNING "%s: gave up waiting for init of module %s.\n", | |
49668688 | 1303 | mod->name, owner); |
9bea7f23 RR |
1304 | } |
1305 | return ksym; | |
1306 | } | |
1307 | ||
1da177e4 LT |
1308 | /* |
1309 | * /sys/module/foo/sections stuff | |
1310 | * J. Corbet <corbet@lwn.net> | |
1311 | */ | |
8f6d0378 | 1312 | #ifdef CONFIG_SYSFS |
10b465aa | 1313 | |
8f6d0378 | 1314 | #ifdef CONFIG_KALLSYMS |
10b465aa BH |
1315 | static inline bool sect_empty(const Elf_Shdr *sect) |
1316 | { | |
1317 | return !(sect->sh_flags & SHF_ALLOC) || sect->sh_size == 0; | |
1318 | } | |
1319 | ||
a58730c4 RR |
1320 | struct module_sect_attr |
1321 | { | |
1322 | struct module_attribute mattr; | |
1323 | char *name; | |
1324 | unsigned long address; | |
1325 | }; | |
1326 | ||
1327 | struct module_sect_attrs | |
1328 | { | |
1329 | struct attribute_group grp; | |
1330 | unsigned int nsections; | |
1331 | struct module_sect_attr attrs[0]; | |
1332 | }; | |
1333 | ||
1da177e4 | 1334 | static ssize_t module_sect_show(struct module_attribute *mattr, |
4befb026 | 1335 | struct module_kobject *mk, char *buf) |
1da177e4 LT |
1336 | { |
1337 | struct module_sect_attr *sattr = | |
1338 | container_of(mattr, struct module_sect_attr, mattr); | |
9f36e2c4 | 1339 | return sprintf(buf, "0x%pK\n", (void *)sattr->address); |
1da177e4 LT |
1340 | } |
1341 | ||
04b1db9f IN |
1342 | static void free_sect_attrs(struct module_sect_attrs *sect_attrs) |
1343 | { | |
a58730c4 | 1344 | unsigned int section; |
04b1db9f IN |
1345 | |
1346 | for (section = 0; section < sect_attrs->nsections; section++) | |
1347 | kfree(sect_attrs->attrs[section].name); | |
1348 | kfree(sect_attrs); | |
1349 | } | |
1350 | ||
8f6d0378 | 1351 | static void add_sect_attrs(struct module *mod, const struct load_info *info) |
1da177e4 LT |
1352 | { |
1353 | unsigned int nloaded = 0, i, size[2]; | |
1354 | struct module_sect_attrs *sect_attrs; | |
1355 | struct module_sect_attr *sattr; | |
1356 | struct attribute **gattr; | |
22a8bdeb | 1357 | |
1da177e4 | 1358 | /* Count loaded sections and allocate structures */ |
8f6d0378 RR |
1359 | for (i = 0; i < info->hdr->e_shnum; i++) |
1360 | if (!sect_empty(&info->sechdrs[i])) | |
1da177e4 LT |
1361 | nloaded++; |
1362 | size[0] = ALIGN(sizeof(*sect_attrs) | |
1363 | + nloaded * sizeof(sect_attrs->attrs[0]), | |
1364 | sizeof(sect_attrs->grp.attrs[0])); | |
1365 | size[1] = (nloaded + 1) * sizeof(sect_attrs->grp.attrs[0]); | |
04b1db9f IN |
1366 | sect_attrs = kzalloc(size[0] + size[1], GFP_KERNEL); |
1367 | if (sect_attrs == NULL) | |
1da177e4 LT |
1368 | return; |
1369 | ||
1370 | /* Setup section attributes. */ | |
1371 | sect_attrs->grp.name = "sections"; | |
1372 | sect_attrs->grp.attrs = (void *)sect_attrs + size[0]; | |
1373 | ||
04b1db9f | 1374 | sect_attrs->nsections = 0; |
1da177e4 LT |
1375 | sattr = §_attrs->attrs[0]; |
1376 | gattr = §_attrs->grp.attrs[0]; | |
8f6d0378 RR |
1377 | for (i = 0; i < info->hdr->e_shnum; i++) { |
1378 | Elf_Shdr *sec = &info->sechdrs[i]; | |
1379 | if (sect_empty(sec)) | |
35dead42 | 1380 | continue; |
8f6d0378 RR |
1381 | sattr->address = sec->sh_addr; |
1382 | sattr->name = kstrdup(info->secstrings + sec->sh_name, | |
04b1db9f IN |
1383 | GFP_KERNEL); |
1384 | if (sattr->name == NULL) | |
1385 | goto out; | |
1386 | sect_attrs->nsections++; | |
361795b1 | 1387 | sysfs_attr_init(&sattr->mattr.attr); |
1da177e4 LT |
1388 | sattr->mattr.show = module_sect_show; |
1389 | sattr->mattr.store = NULL; | |
1390 | sattr->mattr.attr.name = sattr->name; | |
1da177e4 LT |
1391 | sattr->mattr.attr.mode = S_IRUGO; |
1392 | *(gattr++) = &(sattr++)->mattr.attr; | |
1393 | } | |
1394 | *gattr = NULL; | |
1395 | ||
1396 | if (sysfs_create_group(&mod->mkobj.kobj, §_attrs->grp)) | |
1397 | goto out; | |
1398 | ||
1399 | mod->sect_attrs = sect_attrs; | |
1400 | return; | |
1401 | out: | |
04b1db9f | 1402 | free_sect_attrs(sect_attrs); |
1da177e4 LT |
1403 | } |
1404 | ||
1405 | static void remove_sect_attrs(struct module *mod) | |
1406 | { | |
1407 | if (mod->sect_attrs) { | |
1408 | sysfs_remove_group(&mod->mkobj.kobj, | |
1409 | &mod->sect_attrs->grp); | |
1410 | /* We are positive that no one is using any sect attrs | |
1411 | * at this point. Deallocate immediately. */ | |
04b1db9f | 1412 | free_sect_attrs(mod->sect_attrs); |
1da177e4 LT |
1413 | mod->sect_attrs = NULL; |
1414 | } | |
1415 | } | |
1416 | ||
6d760133 RM |
1417 | /* |
1418 | * /sys/module/foo/notes/.section.name gives contents of SHT_NOTE sections. | |
1419 | */ | |
1420 | ||
1421 | struct module_notes_attrs { | |
1422 | struct kobject *dir; | |
1423 | unsigned int notes; | |
1424 | struct bin_attribute attrs[0]; | |
1425 | }; | |
1426 | ||
2c3c8bea | 1427 | static ssize_t module_notes_read(struct file *filp, struct kobject *kobj, |
6d760133 RM |
1428 | struct bin_attribute *bin_attr, |
1429 | char *buf, loff_t pos, size_t count) | |
1430 | { | |
1431 | /* | |
1432 | * The caller checked the pos and count against our size. | |
1433 | */ | |
1434 | memcpy(buf, bin_attr->private + pos, count); | |
1435 | return count; | |
1436 | } | |
1437 | ||
1438 | static void free_notes_attrs(struct module_notes_attrs *notes_attrs, | |
1439 | unsigned int i) | |
1440 | { | |
1441 | if (notes_attrs->dir) { | |
1442 | while (i-- > 0) | |
1443 | sysfs_remove_bin_file(notes_attrs->dir, | |
1444 | ¬es_attrs->attrs[i]); | |
e9432093 | 1445 | kobject_put(notes_attrs->dir); |
6d760133 RM |
1446 | } |
1447 | kfree(notes_attrs); | |
1448 | } | |
1449 | ||
8f6d0378 | 1450 | static void add_notes_attrs(struct module *mod, const struct load_info *info) |
6d760133 RM |
1451 | { |
1452 | unsigned int notes, loaded, i; | |
1453 | struct module_notes_attrs *notes_attrs; | |
1454 | struct bin_attribute *nattr; | |
1455 | ||
ea6bff36 IM |
1456 | /* failed to create section attributes, so can't create notes */ |
1457 | if (!mod->sect_attrs) | |
1458 | return; | |
1459 | ||
6d760133 RM |
1460 | /* Count notes sections and allocate structures. */ |
1461 | notes = 0; | |
8f6d0378 RR |
1462 | for (i = 0; i < info->hdr->e_shnum; i++) |
1463 | if (!sect_empty(&info->sechdrs[i]) && | |
1464 | (info->sechdrs[i].sh_type == SHT_NOTE)) | |
6d760133 RM |
1465 | ++notes; |
1466 | ||
1467 | if (notes == 0) | |
1468 | return; | |
1469 | ||
1470 | notes_attrs = kzalloc(sizeof(*notes_attrs) | |
1471 | + notes * sizeof(notes_attrs->attrs[0]), | |
1472 | GFP_KERNEL); | |
1473 | if (notes_attrs == NULL) | |
1474 | return; | |
1475 | ||
1476 | notes_attrs->notes = notes; | |
1477 | nattr = ¬es_attrs->attrs[0]; | |
8f6d0378 RR |
1478 | for (loaded = i = 0; i < info->hdr->e_shnum; ++i) { |
1479 | if (sect_empty(&info->sechdrs[i])) | |
6d760133 | 1480 | continue; |
8f6d0378 | 1481 | if (info->sechdrs[i].sh_type == SHT_NOTE) { |
361795b1 | 1482 | sysfs_bin_attr_init(nattr); |
6d760133 RM |
1483 | nattr->attr.name = mod->sect_attrs->attrs[loaded].name; |
1484 | nattr->attr.mode = S_IRUGO; | |
8f6d0378 RR |
1485 | nattr->size = info->sechdrs[i].sh_size; |
1486 | nattr->private = (void *) info->sechdrs[i].sh_addr; | |
6d760133 RM |
1487 | nattr->read = module_notes_read; |
1488 | ++nattr; | |
1489 | } | |
1490 | ++loaded; | |
1491 | } | |
1492 | ||
4ff6abff | 1493 | notes_attrs->dir = kobject_create_and_add("notes", &mod->mkobj.kobj); |
6d760133 RM |
1494 | if (!notes_attrs->dir) |
1495 | goto out; | |
1496 | ||
1497 | for (i = 0; i < notes; ++i) | |
1498 | if (sysfs_create_bin_file(notes_attrs->dir, | |
1499 | ¬es_attrs->attrs[i])) | |
1500 | goto out; | |
1501 | ||
1502 | mod->notes_attrs = notes_attrs; | |
1503 | return; | |
1504 | ||
1505 | out: | |
1506 | free_notes_attrs(notes_attrs, i); | |
1507 | } | |
1508 | ||
1509 | static void remove_notes_attrs(struct module *mod) | |
1510 | { | |
1511 | if (mod->notes_attrs) | |
1512 | free_notes_attrs(mod->notes_attrs, mod->notes_attrs->notes); | |
1513 | } | |
1514 | ||
1da177e4 | 1515 | #else |
04b1db9f | 1516 | |
8f6d0378 RR |
1517 | static inline void add_sect_attrs(struct module *mod, |
1518 | const struct load_info *info) | |
1da177e4 LT |
1519 | { |
1520 | } | |
1521 | ||
1522 | static inline void remove_sect_attrs(struct module *mod) | |
1523 | { | |
1524 | } | |
6d760133 | 1525 | |
8f6d0378 RR |
1526 | static inline void add_notes_attrs(struct module *mod, |
1527 | const struct load_info *info) | |
6d760133 RM |
1528 | { |
1529 | } | |
1530 | ||
1531 | static inline void remove_notes_attrs(struct module *mod) | |
1532 | { | |
1533 | } | |
8f6d0378 | 1534 | #endif /* CONFIG_KALLSYMS */ |
1da177e4 | 1535 | |
80a3d1bb RR |
1536 | static void add_usage_links(struct module *mod) |
1537 | { | |
1538 | #ifdef CONFIG_MODULE_UNLOAD | |
1539 | struct module_use *use; | |
1540 | int nowarn; | |
1541 | ||
75676500 | 1542 | mutex_lock(&module_mutex); |
80a3d1bb RR |
1543 | list_for_each_entry(use, &mod->target_list, target_list) { |
1544 | nowarn = sysfs_create_link(use->target->holders_dir, | |
1545 | &mod->mkobj.kobj, mod->name); | |
1546 | } | |
75676500 | 1547 | mutex_unlock(&module_mutex); |
80a3d1bb RR |
1548 | #endif |
1549 | } | |
1550 | ||
1551 | static void del_usage_links(struct module *mod) | |
1552 | { | |
1553 | #ifdef CONFIG_MODULE_UNLOAD | |
1554 | struct module_use *use; | |
1555 | ||
75676500 | 1556 | mutex_lock(&module_mutex); |
80a3d1bb RR |
1557 | list_for_each_entry(use, &mod->target_list, target_list) |
1558 | sysfs_remove_link(use->target->holders_dir, mod->name); | |
75676500 | 1559 | mutex_unlock(&module_mutex); |
80a3d1bb RR |
1560 | #endif |
1561 | } | |
1562 | ||
6407ebb2 | 1563 | static int module_add_modinfo_attrs(struct module *mod) |
c988d2b2 MD |
1564 | { |
1565 | struct module_attribute *attr; | |
03e88ae1 | 1566 | struct module_attribute *temp_attr; |
c988d2b2 MD |
1567 | int error = 0; |
1568 | int i; | |
1569 | ||
03e88ae1 GKH |
1570 | mod->modinfo_attrs = kzalloc((sizeof(struct module_attribute) * |
1571 | (ARRAY_SIZE(modinfo_attrs) + 1)), | |
1572 | GFP_KERNEL); | |
1573 | if (!mod->modinfo_attrs) | |
1574 | return -ENOMEM; | |
1575 | ||
1576 | temp_attr = mod->modinfo_attrs; | |
c988d2b2 MD |
1577 | for (i = 0; (attr = modinfo_attrs[i]) && !error; i++) { |
1578 | if (!attr->test || | |
03e88ae1 GKH |
1579 | (attr->test && attr->test(mod))) { |
1580 | memcpy(temp_attr, attr, sizeof(*temp_attr)); | |
361795b1 | 1581 | sysfs_attr_init(&temp_attr->attr); |
03e88ae1 GKH |
1582 | error = sysfs_create_file(&mod->mkobj.kobj,&temp_attr->attr); |
1583 | ++temp_attr; | |
1584 | } | |
c988d2b2 MD |
1585 | } |
1586 | return error; | |
1587 | } | |
1588 | ||
6407ebb2 | 1589 | static void module_remove_modinfo_attrs(struct module *mod) |
c988d2b2 MD |
1590 | { |
1591 | struct module_attribute *attr; | |
1592 | int i; | |
1593 | ||
03e88ae1 GKH |
1594 | for (i = 0; (attr = &mod->modinfo_attrs[i]); i++) { |
1595 | /* pick a field to test for end of list */ | |
1596 | if (!attr->attr.name) | |
1597 | break; | |
c988d2b2 | 1598 | sysfs_remove_file(&mod->mkobj.kobj,&attr->attr); |
03e88ae1 GKH |
1599 | if (attr->free) |
1600 | attr->free(mod); | |
c988d2b2 | 1601 | } |
03e88ae1 | 1602 | kfree(mod->modinfo_attrs); |
c988d2b2 | 1603 | } |
1da177e4 | 1604 | |
6407ebb2 | 1605 | static int mod_sysfs_init(struct module *mod) |
1da177e4 LT |
1606 | { |
1607 | int err; | |
6494a93d | 1608 | struct kobject *kobj; |
1da177e4 | 1609 | |
823bccfc GKH |
1610 | if (!module_sysfs_initialized) { |
1611 | printk(KERN_ERR "%s: module sysfs not initialized\n", | |
1cc5f714 ES |
1612 | mod->name); |
1613 | err = -EINVAL; | |
1614 | goto out; | |
1615 | } | |
6494a93d GKH |
1616 | |
1617 | kobj = kset_find_obj(module_kset, mod->name); | |
1618 | if (kobj) { | |
1619 | printk(KERN_ERR "%s: module is already loaded\n", mod->name); | |
1620 | kobject_put(kobj); | |
1621 | err = -EINVAL; | |
1622 | goto out; | |
1623 | } | |
1624 | ||
1da177e4 | 1625 | mod->mkobj.mod = mod; |
e17e0f51 | 1626 | |
ac3c8141 GKH |
1627 | memset(&mod->mkobj.kobj, 0, sizeof(mod->mkobj.kobj)); |
1628 | mod->mkobj.kobj.kset = module_kset; | |
1629 | err = kobject_init_and_add(&mod->mkobj.kobj, &module_ktype, NULL, | |
1630 | "%s", mod->name); | |
1631 | if (err) | |
1632 | kobject_put(&mod->mkobj.kobj); | |
270a6c4c | 1633 | |
97c146ef | 1634 | /* delay uevent until full sysfs population */ |
270a6c4c KS |
1635 | out: |
1636 | return err; | |
1637 | } | |
1638 | ||
6407ebb2 | 1639 | static int mod_sysfs_setup(struct module *mod, |
8f6d0378 | 1640 | const struct load_info *info, |
270a6c4c KS |
1641 | struct kernel_param *kparam, |
1642 | unsigned int num_params) | |
1643 | { | |
1644 | int err; | |
1645 | ||
80a3d1bb RR |
1646 | err = mod_sysfs_init(mod); |
1647 | if (err) | |
1648 | goto out; | |
1649 | ||
4ff6abff | 1650 | mod->holders_dir = kobject_create_and_add("holders", &mod->mkobj.kobj); |
240936e1 AM |
1651 | if (!mod->holders_dir) { |
1652 | err = -ENOMEM; | |
270a6c4c | 1653 | goto out_unreg; |
240936e1 | 1654 | } |
270a6c4c | 1655 | |
1da177e4 LT |
1656 | err = module_param_sysfs_setup(mod, kparam, num_params); |
1657 | if (err) | |
270a6c4c | 1658 | goto out_unreg_holders; |
1da177e4 | 1659 | |
c988d2b2 MD |
1660 | err = module_add_modinfo_attrs(mod); |
1661 | if (err) | |
e17e0f51 | 1662 | goto out_unreg_param; |
c988d2b2 | 1663 | |
80a3d1bb | 1664 | add_usage_links(mod); |
8f6d0378 RR |
1665 | add_sect_attrs(mod, info); |
1666 | add_notes_attrs(mod, info); | |
80a3d1bb | 1667 | |
e17e0f51 | 1668 | kobject_uevent(&mod->mkobj.kobj, KOBJ_ADD); |
1da177e4 LT |
1669 | return 0; |
1670 | ||
e17e0f51 KS |
1671 | out_unreg_param: |
1672 | module_param_sysfs_remove(mod); | |
270a6c4c | 1673 | out_unreg_holders: |
78a2d906 | 1674 | kobject_put(mod->holders_dir); |
270a6c4c | 1675 | out_unreg: |
e17e0f51 | 1676 | kobject_put(&mod->mkobj.kobj); |
80a3d1bb | 1677 | out: |
1da177e4 LT |
1678 | return err; |
1679 | } | |
34e4e2fe DL |
1680 | |
1681 | static void mod_sysfs_fini(struct module *mod) | |
1682 | { | |
8f6d0378 RR |
1683 | remove_notes_attrs(mod); |
1684 | remove_sect_attrs(mod); | |
34e4e2fe DL |
1685 | kobject_put(&mod->mkobj.kobj); |
1686 | } | |
1687 | ||
8f6d0378 | 1688 | #else /* !CONFIG_SYSFS */ |
34e4e2fe | 1689 | |
8f6d0378 RR |
1690 | static int mod_sysfs_setup(struct module *mod, |
1691 | const struct load_info *info, | |
6407ebb2 RR |
1692 | struct kernel_param *kparam, |
1693 | unsigned int num_params) | |
1694 | { | |
1695 | return 0; | |
1696 | } | |
1697 | ||
34e4e2fe DL |
1698 | static void mod_sysfs_fini(struct module *mod) |
1699 | { | |
1700 | } | |
1701 | ||
36b0360d RR |
1702 | static void module_remove_modinfo_attrs(struct module *mod) |
1703 | { | |
1704 | } | |
1705 | ||
80a3d1bb RR |
1706 | static void del_usage_links(struct module *mod) |
1707 | { | |
1708 | } | |
1709 | ||
34e4e2fe | 1710 | #endif /* CONFIG_SYSFS */ |
1da177e4 | 1711 | |
36b0360d | 1712 | static void mod_sysfs_teardown(struct module *mod) |
1da177e4 | 1713 | { |
80a3d1bb | 1714 | del_usage_links(mod); |
c988d2b2 | 1715 | module_remove_modinfo_attrs(mod); |
1da177e4 | 1716 | module_param_sysfs_remove(mod); |
78a2d906 GKH |
1717 | kobject_put(mod->mkobj.drivers_dir); |
1718 | kobject_put(mod->holders_dir); | |
34e4e2fe | 1719 | mod_sysfs_fini(mod); |
1da177e4 LT |
1720 | } |
1721 | ||
1722 | /* | |
1723 | * unlink the module with the whole machine is stopped with interrupts off | |
1724 | * - this defends against kallsyms not taking locks | |
1725 | */ | |
1726 | static int __unlink_module(void *_mod) | |
1727 | { | |
1728 | struct module *mod = _mod; | |
1729 | list_del(&mod->list); | |
5336377d | 1730 | module_bug_cleanup(mod); |
1da177e4 LT |
1731 | return 0; |
1732 | } | |
1733 | ||
84e1c6bb | 1734 | #ifdef CONFIG_DEBUG_SET_MODULE_RONX |
1735 | /* | |
1736 | * LKM RO/NX protection: protect module's text/ro-data | |
1737 | * from modification and any data from execution. | |
1738 | */ | |
1739 | void set_page_attributes(void *start, void *end, int (*set)(unsigned long start, int num_pages)) | |
1740 | { | |
1741 | unsigned long begin_pfn = PFN_DOWN((unsigned long)start); | |
1742 | unsigned long end_pfn = PFN_DOWN((unsigned long)end); | |
1743 | ||
1744 | if (end_pfn > begin_pfn) | |
1745 | set(begin_pfn << PAGE_SHIFT, end_pfn - begin_pfn); | |
1746 | } | |
1747 | ||
1748 | static void set_section_ro_nx(void *base, | |
1749 | unsigned long text_size, | |
1750 | unsigned long ro_size, | |
1751 | unsigned long total_size) | |
1752 | { | |
1753 | /* begin and end PFNs of the current subsection */ | |
1754 | unsigned long begin_pfn; | |
1755 | unsigned long end_pfn; | |
1756 | ||
1757 | /* | |
1758 | * Set RO for module text and RO-data: | |
1759 | * - Always protect first page. | |
1760 | * - Do not protect last partial page. | |
1761 | */ | |
1762 | if (ro_size > 0) | |
1763 | set_page_attributes(base, base + ro_size, set_memory_ro); | |
1764 | ||
1765 | /* | |
1766 | * Set NX permissions for module data: | |
1767 | * - Do not protect first partial page. | |
1768 | * - Always protect last page. | |
1769 | */ | |
1770 | if (total_size > text_size) { | |
1771 | begin_pfn = PFN_UP((unsigned long)base + text_size); | |
1772 | end_pfn = PFN_UP((unsigned long)base + total_size); | |
1773 | if (end_pfn > begin_pfn) | |
1774 | set_memory_nx(begin_pfn << PAGE_SHIFT, end_pfn - begin_pfn); | |
1775 | } | |
1776 | } | |
1777 | ||
01526ed0 JG |
1778 | static void unset_module_core_ro_nx(struct module *mod) |
1779 | { | |
1780 | set_page_attributes(mod->module_core + mod->core_text_size, | |
1781 | mod->module_core + mod->core_size, | |
1782 | set_memory_x); | |
1783 | set_page_attributes(mod->module_core, | |
1784 | mod->module_core + mod->core_ro_size, | |
1785 | set_memory_rw); | |
1786 | } | |
1787 | ||
1788 | static void unset_module_init_ro_nx(struct module *mod) | |
1789 | { | |
1790 | set_page_attributes(mod->module_init + mod->init_text_size, | |
1791 | mod->module_init + mod->init_size, | |
1792 | set_memory_x); | |
1793 | set_page_attributes(mod->module_init, | |
1794 | mod->module_init + mod->init_ro_size, | |
1795 | set_memory_rw); | |
84e1c6bb | 1796 | } |
1797 | ||
1798 | /* Iterate through all modules and set each module's text as RW */ | |
5d05c708 | 1799 | void set_all_modules_text_rw(void) |
84e1c6bb | 1800 | { |
1801 | struct module *mod; | |
1802 | ||
1803 | mutex_lock(&module_mutex); | |
1804 | list_for_each_entry_rcu(mod, &modules, list) { | |
0d21b0e3 RR |
1805 | if (mod->state == MODULE_STATE_UNFORMED) |
1806 | continue; | |
84e1c6bb | 1807 | if ((mod->module_core) && (mod->core_text_size)) { |
1808 | set_page_attributes(mod->module_core, | |
1809 | mod->module_core + mod->core_text_size, | |
1810 | set_memory_rw); | |
1811 | } | |
1812 | if ((mod->module_init) && (mod->init_text_size)) { | |
1813 | set_page_attributes(mod->module_init, | |
1814 | mod->module_init + mod->init_text_size, | |
1815 | set_memory_rw); | |
1816 | } | |
1817 | } | |
1818 | mutex_unlock(&module_mutex); | |
1819 | } | |
1820 | ||
1821 | /* Iterate through all modules and set each module's text as RO */ | |
5d05c708 | 1822 | void set_all_modules_text_ro(void) |
84e1c6bb | 1823 | { |
1824 | struct module *mod; | |
1825 | ||
1826 | mutex_lock(&module_mutex); | |
1827 | list_for_each_entry_rcu(mod, &modules, list) { | |
0d21b0e3 RR |
1828 | if (mod->state == MODULE_STATE_UNFORMED) |
1829 | continue; | |
84e1c6bb | 1830 | if ((mod->module_core) && (mod->core_text_size)) { |
1831 | set_page_attributes(mod->module_core, | |
1832 | mod->module_core + mod->core_text_size, | |
1833 | set_memory_ro); | |
1834 | } | |
1835 | if ((mod->module_init) && (mod->init_text_size)) { | |
1836 | set_page_attributes(mod->module_init, | |
1837 | mod->module_init + mod->init_text_size, | |
1838 | set_memory_ro); | |
1839 | } | |
1840 | } | |
1841 | mutex_unlock(&module_mutex); | |
1842 | } | |
1843 | #else | |
1844 | static inline void set_section_ro_nx(void *base, unsigned long text_size, unsigned long ro_size, unsigned long total_size) { } | |
01526ed0 JG |
1845 | static void unset_module_core_ro_nx(struct module *mod) { } |
1846 | static void unset_module_init_ro_nx(struct module *mod) { } | |
84e1c6bb | 1847 | #endif |
1848 | ||
74e08fcf JB |
1849 | void __weak module_free(struct module *mod, void *module_region) |
1850 | { | |
1851 | vfree(module_region); | |
1852 | } | |
1853 | ||
1854 | void __weak module_arch_cleanup(struct module *mod) | |
1855 | { | |
1856 | } | |
1857 | ||
75676500 | 1858 | /* Free a module, remove from lists, etc. */ |
1da177e4 LT |
1859 | static void free_module(struct module *mod) |
1860 | { | |
7ead8b83 LZ |
1861 | trace_module_free(mod); |
1862 | ||
1da177e4 | 1863 | /* Delete from various lists */ |
75676500 | 1864 | mutex_lock(&module_mutex); |
9b1a4d38 | 1865 | stop_machine(__unlink_module, mod, NULL); |
75676500 | 1866 | mutex_unlock(&module_mutex); |
36b0360d | 1867 | mod_sysfs_teardown(mod); |
1da177e4 | 1868 | |
b82bab4b JB |
1869 | /* Remove dynamic debug info */ |
1870 | ddebug_remove_module(mod->name); | |
1871 | ||
1da177e4 LT |
1872 | /* Arch-specific cleanup. */ |
1873 | module_arch_cleanup(mod); | |
1874 | ||
1875 | /* Module unload stuff */ | |
1876 | module_unload_free(mod); | |
1877 | ||
e180a6b7 RR |
1878 | /* Free any allocated parameters. */ |
1879 | destroy_params(mod->kp, mod->num_kp); | |
1880 | ||
1da177e4 | 1881 | /* This may be NULL, but that's OK */ |
01526ed0 | 1882 | unset_module_init_ro_nx(mod); |
1da177e4 LT |
1883 | module_free(mod, mod->module_init); |
1884 | kfree(mod->args); | |
259354de | 1885 | percpu_modfree(mod); |
9f85a4bb | 1886 | |
fbb9ce95 IM |
1887 | /* Free lock-classes: */ |
1888 | lockdep_free_key_range(mod->module_core, mod->core_size); | |
1889 | ||
1da177e4 | 1890 | /* Finally, free the core (containing the module structure) */ |
01526ed0 | 1891 | unset_module_core_ro_nx(mod); |
1da177e4 | 1892 | module_free(mod, mod->module_core); |
eb8cdec4 BS |
1893 | |
1894 | #ifdef CONFIG_MPU | |
1895 | update_protections(current->mm); | |
1896 | #endif | |
1da177e4 LT |
1897 | } |
1898 | ||
1899 | void *__symbol_get(const char *symbol) | |
1900 | { | |
1901 | struct module *owner; | |
414fd31b | 1902 | const struct kernel_symbol *sym; |
1da177e4 | 1903 | |
24da1cbf | 1904 | preempt_disable(); |
414fd31b TA |
1905 | sym = find_symbol(symbol, &owner, NULL, true, true); |
1906 | if (sym && strong_try_module_get(owner)) | |
1907 | sym = NULL; | |
24da1cbf | 1908 | preempt_enable(); |
1da177e4 | 1909 | |
414fd31b | 1910 | return sym ? (void *)sym->value : NULL; |
1da177e4 LT |
1911 | } |
1912 | EXPORT_SYMBOL_GPL(__symbol_get); | |
1913 | ||
eea8b54d AN |
1914 | /* |
1915 | * Ensure that an exported symbol [global namespace] does not already exist | |
02a3e59a | 1916 | * in the kernel or in some other module's exported symbol table. |
be593f4c RR |
1917 | * |
1918 | * You must hold the module_mutex. | |
eea8b54d AN |
1919 | */ |
1920 | static int verify_export_symbols(struct module *mod) | |
1921 | { | |
b211104d | 1922 | unsigned int i; |
eea8b54d | 1923 | struct module *owner; |
b211104d RR |
1924 | const struct kernel_symbol *s; |
1925 | struct { | |
1926 | const struct kernel_symbol *sym; | |
1927 | unsigned int num; | |
1928 | } arr[] = { | |
1929 | { mod->syms, mod->num_syms }, | |
1930 | { mod->gpl_syms, mod->num_gpl_syms }, | |
1931 | { mod->gpl_future_syms, mod->num_gpl_future_syms }, | |
f7f5b675 | 1932 | #ifdef CONFIG_UNUSED_SYMBOLS |
b211104d RR |
1933 | { mod->unused_syms, mod->num_unused_syms }, |
1934 | { mod->unused_gpl_syms, mod->num_unused_gpl_syms }, | |
f7f5b675 | 1935 | #endif |
b211104d | 1936 | }; |
eea8b54d | 1937 | |
b211104d RR |
1938 | for (i = 0; i < ARRAY_SIZE(arr); i++) { |
1939 | for (s = arr[i].sym; s < arr[i].sym + arr[i].num; s++) { | |
be593f4c | 1940 | if (find_symbol(s->name, &owner, NULL, true, false)) { |
b211104d RR |
1941 | printk(KERN_ERR |
1942 | "%s: exports duplicate symbol %s" | |
1943 | " (owned by %s)\n", | |
1944 | mod->name, s->name, module_name(owner)); | |
1945 | return -ENOEXEC; | |
1946 | } | |
eea8b54d | 1947 | } |
b211104d RR |
1948 | } |
1949 | return 0; | |
eea8b54d AN |
1950 | } |
1951 | ||
9a4b9708 | 1952 | /* Change all symbols so that st_value encodes the pointer directly. */ |
49668688 RR |
1953 | static int simplify_symbols(struct module *mod, const struct load_info *info) |
1954 | { | |
1955 | Elf_Shdr *symsec = &info->sechdrs[info->index.sym]; | |
1956 | Elf_Sym *sym = (void *)symsec->sh_addr; | |
1da177e4 | 1957 | unsigned long secbase; |
49668688 | 1958 | unsigned int i; |
1da177e4 | 1959 | int ret = 0; |
414fd31b | 1960 | const struct kernel_symbol *ksym; |
1da177e4 | 1961 | |
49668688 RR |
1962 | for (i = 1; i < symsec->sh_size / sizeof(Elf_Sym); i++) { |
1963 | const char *name = info->strtab + sym[i].st_name; | |
1964 | ||
1da177e4 LT |
1965 | switch (sym[i].st_shndx) { |
1966 | case SHN_COMMON: | |
1967 | /* We compiled with -fno-common. These are not | |
1968 | supposed to happen. */ | |
5e124169 | 1969 | pr_debug("Common symbol: %s\n", name); |
1da177e4 LT |
1970 | printk("%s: please compile with -fno-common\n", |
1971 | mod->name); | |
1972 | ret = -ENOEXEC; | |
1973 | break; | |
1974 | ||
1975 | case SHN_ABS: | |
1976 | /* Don't need to do anything */ | |
5e124169 | 1977 | pr_debug("Absolute symbol: 0x%08lx\n", |
1da177e4 LT |
1978 | (long)sym[i].st_value); |
1979 | break; | |
1980 | ||
1981 | case SHN_UNDEF: | |
49668688 | 1982 | ksym = resolve_symbol_wait(mod, info, name); |
1da177e4 | 1983 | /* Ok if resolved. */ |
9bea7f23 | 1984 | if (ksym && !IS_ERR(ksym)) { |
414fd31b | 1985 | sym[i].st_value = ksym->value; |
1da177e4 | 1986 | break; |
414fd31b TA |
1987 | } |
1988 | ||
1da177e4 | 1989 | /* Ok if weak. */ |
9bea7f23 | 1990 | if (!ksym && ELF_ST_BIND(sym[i].st_info) == STB_WEAK) |
1da177e4 LT |
1991 | break; |
1992 | ||
9bea7f23 | 1993 | printk(KERN_WARNING "%s: Unknown symbol %s (err %li)\n", |
49668688 | 1994 | mod->name, name, PTR_ERR(ksym)); |
9bea7f23 | 1995 | ret = PTR_ERR(ksym) ?: -ENOENT; |
1da177e4 LT |
1996 | break; |
1997 | ||
1998 | default: | |
1999 | /* Divert to percpu allocation if a percpu var. */ | |
49668688 | 2000 | if (sym[i].st_shndx == info->index.pcpu) |
259354de | 2001 | secbase = (unsigned long)mod_percpu(mod); |
1da177e4 | 2002 | else |
49668688 | 2003 | secbase = info->sechdrs[sym[i].st_shndx].sh_addr; |
1da177e4 LT |
2004 | sym[i].st_value += secbase; |
2005 | break; | |
2006 | } | |
2007 | } | |
2008 | ||
2009 | return ret; | |
2010 | } | |
2011 | ||
49668688 | 2012 | static int apply_relocations(struct module *mod, const struct load_info *info) |
22e268eb RR |
2013 | { |
2014 | unsigned int i; | |
2015 | int err = 0; | |
2016 | ||
2017 | /* Now do relocations. */ | |
49668688 RR |
2018 | for (i = 1; i < info->hdr->e_shnum; i++) { |
2019 | unsigned int infosec = info->sechdrs[i].sh_info; | |
22e268eb RR |
2020 | |
2021 | /* Not a valid relocation section? */ | |
49668688 | 2022 | if (infosec >= info->hdr->e_shnum) |
22e268eb RR |
2023 | continue; |
2024 | ||
2025 | /* Don't bother with non-allocated sections */ | |
49668688 | 2026 | if (!(info->sechdrs[infosec].sh_flags & SHF_ALLOC)) |
22e268eb RR |
2027 | continue; |
2028 | ||
49668688 RR |
2029 | if (info->sechdrs[i].sh_type == SHT_REL) |
2030 | err = apply_relocate(info->sechdrs, info->strtab, | |
2031 | info->index.sym, i, mod); | |
2032 | else if (info->sechdrs[i].sh_type == SHT_RELA) | |
2033 | err = apply_relocate_add(info->sechdrs, info->strtab, | |
2034 | info->index.sym, i, mod); | |
22e268eb RR |
2035 | if (err < 0) |
2036 | break; | |
2037 | } | |
2038 | return err; | |
2039 | } | |
2040 | ||
088af9a6 HD |
2041 | /* Additional bytes needed by arch in front of individual sections */ |
2042 | unsigned int __weak arch_mod_section_prepend(struct module *mod, | |
2043 | unsigned int section) | |
2044 | { | |
2045 | /* default implementation just returns zero */ | |
2046 | return 0; | |
2047 | } | |
2048 | ||
1da177e4 | 2049 | /* Update size with this section: return offset. */ |
088af9a6 HD |
2050 | static long get_offset(struct module *mod, unsigned int *size, |
2051 | Elf_Shdr *sechdr, unsigned int section) | |
1da177e4 LT |
2052 | { |
2053 | long ret; | |
2054 | ||
088af9a6 | 2055 | *size += arch_mod_section_prepend(mod, section); |
1da177e4 LT |
2056 | ret = ALIGN(*size, sechdr->sh_addralign ?: 1); |
2057 | *size = ret + sechdr->sh_size; | |
2058 | return ret; | |
2059 | } | |
2060 | ||
2061 | /* Lay out the SHF_ALLOC sections in a way not dissimilar to how ld | |
2062 | might -- code, read-only data, read-write data, small data. Tally | |
2063 | sizes, and place the offsets into sh_entsize fields: high bit means it | |
2064 | belongs in init. */ | |
49668688 | 2065 | static void layout_sections(struct module *mod, struct load_info *info) |
1da177e4 LT |
2066 | { |
2067 | static unsigned long const masks[][2] = { | |
2068 | /* NOTE: all executable code must be the first section | |
2069 | * in this array; otherwise modify the text_size | |
2070 | * finder in the two loops below */ | |
2071 | { SHF_EXECINSTR | SHF_ALLOC, ARCH_SHF_SMALL }, | |
2072 | { SHF_ALLOC, SHF_WRITE | ARCH_SHF_SMALL }, | |
2073 | { SHF_WRITE | SHF_ALLOC, ARCH_SHF_SMALL }, | |
2074 | { ARCH_SHF_SMALL | SHF_ALLOC, 0 } | |
2075 | }; | |
2076 | unsigned int m, i; | |
2077 | ||
49668688 RR |
2078 | for (i = 0; i < info->hdr->e_shnum; i++) |
2079 | info->sechdrs[i].sh_entsize = ~0UL; | |
1da177e4 | 2080 | |
5e124169 | 2081 | pr_debug("Core section allocation order:\n"); |
1da177e4 | 2082 | for (m = 0; m < ARRAY_SIZE(masks); ++m) { |
49668688 RR |
2083 | for (i = 0; i < info->hdr->e_shnum; ++i) { |
2084 | Elf_Shdr *s = &info->sechdrs[i]; | |
2085 | const char *sname = info->secstrings + s->sh_name; | |
1da177e4 LT |
2086 | |
2087 | if ((s->sh_flags & masks[m][0]) != masks[m][0] | |
2088 | || (s->sh_flags & masks[m][1]) | |
2089 | || s->sh_entsize != ~0UL | |
49668688 | 2090 | || strstarts(sname, ".init")) |
1da177e4 | 2091 | continue; |
088af9a6 | 2092 | s->sh_entsize = get_offset(mod, &mod->core_size, s, i); |
5e124169 | 2093 | pr_debug("\t%s\n", sname); |
1da177e4 | 2094 | } |
84e1c6bb | 2095 | switch (m) { |
2096 | case 0: /* executable */ | |
2097 | mod->core_size = debug_align(mod->core_size); | |
1da177e4 | 2098 | mod->core_text_size = mod->core_size; |
84e1c6bb | 2099 | break; |
2100 | case 1: /* RO: text and ro-data */ | |
2101 | mod->core_size = debug_align(mod->core_size); | |
2102 | mod->core_ro_size = mod->core_size; | |
2103 | break; | |
2104 | case 3: /* whole core */ | |
2105 | mod->core_size = debug_align(mod->core_size); | |
2106 | break; | |
2107 | } | |
1da177e4 LT |
2108 | } |
2109 | ||
5e124169 | 2110 | pr_debug("Init section allocation order:\n"); |
1da177e4 | 2111 | for (m = 0; m < ARRAY_SIZE(masks); ++m) { |
49668688 RR |
2112 | for (i = 0; i < info->hdr->e_shnum; ++i) { |
2113 | Elf_Shdr *s = &info->sechdrs[i]; | |
2114 | const char *sname = info->secstrings + s->sh_name; | |
1da177e4 LT |
2115 | |
2116 | if ((s->sh_flags & masks[m][0]) != masks[m][0] | |
2117 | || (s->sh_flags & masks[m][1]) | |
2118 | || s->sh_entsize != ~0UL | |
49668688 | 2119 | || !strstarts(sname, ".init")) |
1da177e4 | 2120 | continue; |
088af9a6 | 2121 | s->sh_entsize = (get_offset(mod, &mod->init_size, s, i) |
1da177e4 | 2122 | | INIT_OFFSET_MASK); |
5e124169 | 2123 | pr_debug("\t%s\n", sname); |
1da177e4 | 2124 | } |
84e1c6bb | 2125 | switch (m) { |
2126 | case 0: /* executable */ | |
2127 | mod->init_size = debug_align(mod->init_size); | |
1da177e4 | 2128 | mod->init_text_size = mod->init_size; |
84e1c6bb | 2129 | break; |
2130 | case 1: /* RO: text and ro-data */ | |
2131 | mod->init_size = debug_align(mod->init_size); | |
2132 | mod->init_ro_size = mod->init_size; | |
2133 | break; | |
2134 | case 3: /* whole init */ | |
2135 | mod->init_size = debug_align(mod->init_size); | |
2136 | break; | |
2137 | } | |
1da177e4 LT |
2138 | } |
2139 | } | |
2140 | ||
1da177e4 LT |
2141 | static void set_license(struct module *mod, const char *license) |
2142 | { | |
2143 | if (!license) | |
2144 | license = "unspecified"; | |
2145 | ||
fa3ba2e8 | 2146 | if (!license_is_gpl_compatible(license)) { |
25ddbb18 | 2147 | if (!test_taint(TAINT_PROPRIETARY_MODULE)) |
1d4d2627 | 2148 | printk(KERN_WARNING "%s: module license '%s' taints " |
fa3ba2e8 FM |
2149 | "kernel.\n", mod->name, license); |
2150 | add_taint_module(mod, TAINT_PROPRIETARY_MODULE); | |
1da177e4 LT |
2151 | } |
2152 | } | |
2153 | ||
2154 | /* Parse tag=value strings from .modinfo section */ | |
2155 | static char *next_string(char *string, unsigned long *secsize) | |
2156 | { | |
2157 | /* Skip non-zero chars */ | |
2158 | while (string[0]) { | |
2159 | string++; | |
2160 | if ((*secsize)-- <= 1) | |
2161 | return NULL; | |
2162 | } | |
2163 | ||
2164 | /* Skip any zero padding. */ | |
2165 | while (!string[0]) { | |
2166 | string++; | |
2167 | if ((*secsize)-- <= 1) | |
2168 | return NULL; | |
2169 | } | |
2170 | return string; | |
2171 | } | |
2172 | ||
49668688 | 2173 | static char *get_modinfo(struct load_info *info, const char *tag) |
1da177e4 LT |
2174 | { |
2175 | char *p; | |
2176 | unsigned int taglen = strlen(tag); | |
49668688 RR |
2177 | Elf_Shdr *infosec = &info->sechdrs[info->index.info]; |
2178 | unsigned long size = infosec->sh_size; | |
1da177e4 | 2179 | |
49668688 | 2180 | for (p = (char *)infosec->sh_addr; p; p = next_string(p, &size)) { |
1da177e4 LT |
2181 | if (strncmp(p, tag, taglen) == 0 && p[taglen] == '=') |
2182 | return p + taglen + 1; | |
2183 | } | |
2184 | return NULL; | |
2185 | } | |
2186 | ||
49668688 | 2187 | static void setup_modinfo(struct module *mod, struct load_info *info) |
c988d2b2 MD |
2188 | { |
2189 | struct module_attribute *attr; | |
2190 | int i; | |
2191 | ||
2192 | for (i = 0; (attr = modinfo_attrs[i]); i++) { | |
2193 | if (attr->setup) | |
49668688 | 2194 | attr->setup(mod, get_modinfo(info, attr->attr.name)); |
c988d2b2 MD |
2195 | } |
2196 | } | |
c988d2b2 | 2197 | |
a263f776 RR |
2198 | static void free_modinfo(struct module *mod) |
2199 | { | |
2200 | struct module_attribute *attr; | |
2201 | int i; | |
2202 | ||
2203 | for (i = 0; (attr = modinfo_attrs[i]); i++) { | |
2204 | if (attr->free) | |
2205 | attr->free(mod); | |
2206 | } | |
2207 | } | |
2208 | ||
1da177e4 | 2209 | #ifdef CONFIG_KALLSYMS |
15bba37d WC |
2210 | |
2211 | /* lookup symbol in given range of kernel_symbols */ | |
2212 | static const struct kernel_symbol *lookup_symbol(const char *name, | |
2213 | const struct kernel_symbol *start, | |
2214 | const struct kernel_symbol *stop) | |
2215 | { | |
9d63487f AIB |
2216 | return bsearch(name, start, stop - start, |
2217 | sizeof(struct kernel_symbol), cmp_name); | |
15bba37d WC |
2218 | } |
2219 | ||
ca4787b7 TA |
2220 | static int is_exported(const char *name, unsigned long value, |
2221 | const struct module *mod) | |
1da177e4 | 2222 | { |
ca4787b7 TA |
2223 | const struct kernel_symbol *ks; |
2224 | if (!mod) | |
2225 | ks = lookup_symbol(name, __start___ksymtab, __stop___ksymtab); | |
3fd6805f | 2226 | else |
ca4787b7 TA |
2227 | ks = lookup_symbol(name, mod->syms, mod->syms + mod->num_syms); |
2228 | return ks != NULL && ks->value == value; | |
1da177e4 LT |
2229 | } |
2230 | ||
2231 | /* As per nm */ | |
eded41c1 | 2232 | static char elf_type(const Elf_Sym *sym, const struct load_info *info) |
1da177e4 | 2233 | { |
eded41c1 RR |
2234 | const Elf_Shdr *sechdrs = info->sechdrs; |
2235 | ||
1da177e4 LT |
2236 | if (ELF_ST_BIND(sym->st_info) == STB_WEAK) { |
2237 | if (ELF_ST_TYPE(sym->st_info) == STT_OBJECT) | |
2238 | return 'v'; | |
2239 | else | |
2240 | return 'w'; | |
2241 | } | |
2242 | if (sym->st_shndx == SHN_UNDEF) | |
2243 | return 'U'; | |
2244 | if (sym->st_shndx == SHN_ABS) | |
2245 | return 'a'; | |
2246 | if (sym->st_shndx >= SHN_LORESERVE) | |
2247 | return '?'; | |
2248 | if (sechdrs[sym->st_shndx].sh_flags & SHF_EXECINSTR) | |
2249 | return 't'; | |
2250 | if (sechdrs[sym->st_shndx].sh_flags & SHF_ALLOC | |
2251 | && sechdrs[sym->st_shndx].sh_type != SHT_NOBITS) { | |
2252 | if (!(sechdrs[sym->st_shndx].sh_flags & SHF_WRITE)) | |
2253 | return 'r'; | |
2254 | else if (sechdrs[sym->st_shndx].sh_flags & ARCH_SHF_SMALL) | |
2255 | return 'g'; | |
2256 | else | |
2257 | return 'd'; | |
2258 | } | |
2259 | if (sechdrs[sym->st_shndx].sh_type == SHT_NOBITS) { | |
2260 | if (sechdrs[sym->st_shndx].sh_flags & ARCH_SHF_SMALL) | |
2261 | return 's'; | |
2262 | else | |
2263 | return 'b'; | |
2264 | } | |
eded41c1 RR |
2265 | if (strstarts(info->secstrings + sechdrs[sym->st_shndx].sh_name, |
2266 | ".debug")) { | |
1da177e4 | 2267 | return 'n'; |
eded41c1 | 2268 | } |
1da177e4 LT |
2269 | return '?'; |
2270 | } | |
2271 | ||
4a496226 JB |
2272 | static bool is_core_symbol(const Elf_Sym *src, const Elf_Shdr *sechdrs, |
2273 | unsigned int shnum) | |
2274 | { | |
2275 | const Elf_Shdr *sec; | |
2276 | ||
2277 | if (src->st_shndx == SHN_UNDEF | |
2278 | || src->st_shndx >= shnum | |
2279 | || !src->st_name) | |
2280 | return false; | |
2281 | ||
2282 | sec = sechdrs + src->st_shndx; | |
2283 | if (!(sec->sh_flags & SHF_ALLOC) | |
2284 | #ifndef CONFIG_KALLSYMS_ALL | |
2285 | || !(sec->sh_flags & SHF_EXECINSTR) | |
2286 | #endif | |
2287 | || (sec->sh_entsize & INIT_OFFSET_MASK)) | |
2288 | return false; | |
2289 | ||
2290 | return true; | |
2291 | } | |
2292 | ||
48fd1188 KC |
2293 | /* |
2294 | * We only allocate and copy the strings needed by the parts of symtab | |
2295 | * we keep. This is simple, but has the effect of making multiple | |
2296 | * copies of duplicates. We could be more sophisticated, see | |
2297 | * linux-kernel thread starting with | |
2298 | * <73defb5e4bca04a6431392cc341112b1@localhost>. | |
2299 | */ | |
49668688 | 2300 | static void layout_symtab(struct module *mod, struct load_info *info) |
4a496226 | 2301 | { |
49668688 RR |
2302 | Elf_Shdr *symsect = info->sechdrs + info->index.sym; |
2303 | Elf_Shdr *strsect = info->sechdrs + info->index.str; | |
4a496226 | 2304 | const Elf_Sym *src; |
54523ec7 | 2305 | unsigned int i, nsrc, ndst, strtab_size = 0; |
4a496226 JB |
2306 | |
2307 | /* Put symbol section at end of init part of module. */ | |
2308 | symsect->sh_flags |= SHF_ALLOC; | |
2309 | symsect->sh_entsize = get_offset(mod, &mod->init_size, symsect, | |
49668688 | 2310 | info->index.sym) | INIT_OFFSET_MASK; |
5e124169 | 2311 | pr_debug("\t%s\n", info->secstrings + symsect->sh_name); |
4a496226 | 2312 | |
49668688 | 2313 | src = (void *)info->hdr + symsect->sh_offset; |
4a496226 | 2314 | nsrc = symsect->sh_size / sizeof(*src); |
70b1e916 | 2315 | |
48fd1188 | 2316 | /* Compute total space required for the core symbols' strtab. */ |
59ef28b1 RR |
2317 | for (ndst = i = 0; i < nsrc; i++) { |
2318 | if (i == 0 || | |
2319 | is_core_symbol(src+i, info->sechdrs, info->hdr->e_shnum)) { | |
2320 | strtab_size += strlen(&info->strtab[src[i].st_name])+1; | |
48fd1188 | 2321 | ndst++; |
554bdfe5 | 2322 | } |
59ef28b1 | 2323 | } |
4a496226 JB |
2324 | |
2325 | /* Append room for core symbols at end of core part. */ | |
49668688 | 2326 | info->symoffs = ALIGN(mod->core_size, symsect->sh_addralign ?: 1); |
48fd1188 KC |
2327 | info->stroffs = mod->core_size = info->symoffs + ndst * sizeof(Elf_Sym); |
2328 | mod->core_size += strtab_size; | |
4a496226 | 2329 | |
554bdfe5 JB |
2330 | /* Put string table section at end of init part of module. */ |
2331 | strsect->sh_flags |= SHF_ALLOC; | |
2332 | strsect->sh_entsize = get_offset(mod, &mod->init_size, strsect, | |
49668688 | 2333 | info->index.str) | INIT_OFFSET_MASK; |
5e124169 | 2334 | pr_debug("\t%s\n", info->secstrings + strsect->sh_name); |
4a496226 JB |
2335 | } |
2336 | ||
811d66a0 | 2337 | static void add_kallsyms(struct module *mod, const struct load_info *info) |
1da177e4 | 2338 | { |
4a496226 JB |
2339 | unsigned int i, ndst; |
2340 | const Elf_Sym *src; | |
2341 | Elf_Sym *dst; | |
554bdfe5 | 2342 | char *s; |
eded41c1 | 2343 | Elf_Shdr *symsec = &info->sechdrs[info->index.sym]; |
1da177e4 | 2344 | |
eded41c1 RR |
2345 | mod->symtab = (void *)symsec->sh_addr; |
2346 | mod->num_symtab = symsec->sh_size / sizeof(Elf_Sym); | |
511ca6ae RR |
2347 | /* Make sure we get permanent strtab: don't use info->strtab. */ |
2348 | mod->strtab = (void *)info->sechdrs[info->index.str].sh_addr; | |
1da177e4 LT |
2349 | |
2350 | /* Set types up while we still have access to sections. */ | |
2351 | for (i = 0; i < mod->num_symtab; i++) | |
eded41c1 | 2352 | mod->symtab[i].st_info = elf_type(&mod->symtab[i], info); |
4a496226 | 2353 | |
d913188c | 2354 | mod->core_symtab = dst = mod->module_core + info->symoffs; |
48fd1188 | 2355 | mod->core_strtab = s = mod->module_core + info->stroffs; |
4a496226 | 2356 | src = mod->symtab; |
59ef28b1 RR |
2357 | for (ndst = i = 0; i < mod->num_symtab; i++) { |
2358 | if (i == 0 || | |
2359 | is_core_symbol(src+i, info->sechdrs, info->hdr->e_shnum)) { | |
2360 | dst[ndst] = src[i]; | |
2361 | dst[ndst++].st_name = s - mod->core_strtab; | |
2362 | s += strlcpy(s, &mod->strtab[src[i].st_name], | |
2363 | KSYM_NAME_LEN) + 1; | |
2364 | } | |
4a496226 JB |
2365 | } |
2366 | mod->core_num_syms = ndst; | |
1da177e4 LT |
2367 | } |
2368 | #else | |
49668688 | 2369 | static inline void layout_symtab(struct module *mod, struct load_info *info) |
4a496226 JB |
2370 | { |
2371 | } | |
3ae91c21 | 2372 | |
abbce906 | 2373 | static void add_kallsyms(struct module *mod, const struct load_info *info) |
1da177e4 LT |
2374 | { |
2375 | } | |
2376 | #endif /* CONFIG_KALLSYMS */ | |
2377 | ||
e9d376f0 | 2378 | static void dynamic_debug_setup(struct _ddebug *debug, unsigned int num) |
346e15be | 2379 | { |
811d66a0 RR |
2380 | if (!debug) |
2381 | return; | |
e9d376f0 JB |
2382 | #ifdef CONFIG_DYNAMIC_DEBUG |
2383 | if (ddebug_add_module(debug, num, debug->modname)) | |
2384 | printk(KERN_ERR "dynamic debug error adding module: %s\n", | |
2385 | debug->modname); | |
2386 | #endif | |
5e458cc0 | 2387 | } |
346e15be | 2388 | |
ff49d74a YS |
2389 | static void dynamic_debug_remove(struct _ddebug *debug) |
2390 | { | |
2391 | if (debug) | |
2392 | ddebug_remove_module(debug->modname); | |
2393 | } | |
2394 | ||
74e08fcf JB |
2395 | void * __weak module_alloc(unsigned long size) |
2396 | { | |
82fab442 | 2397 | return vmalloc_exec(size); |
74e08fcf JB |
2398 | } |
2399 | ||
3a642e99 RR |
2400 | static void *module_alloc_update_bounds(unsigned long size) |
2401 | { | |
2402 | void *ret = module_alloc(size); | |
2403 | ||
2404 | if (ret) { | |
75676500 | 2405 | mutex_lock(&module_mutex); |
3a642e99 RR |
2406 | /* Update module bounds. */ |
2407 | if ((unsigned long)ret < module_addr_min) | |
2408 | module_addr_min = (unsigned long)ret; | |
2409 | if ((unsigned long)ret + size > module_addr_max) | |
2410 | module_addr_max = (unsigned long)ret + size; | |
75676500 | 2411 | mutex_unlock(&module_mutex); |
3a642e99 RR |
2412 | } |
2413 | return ret; | |
2414 | } | |
2415 | ||
4f2294b6 | 2416 | #ifdef CONFIG_DEBUG_KMEMLEAK |
49668688 RR |
2417 | static void kmemleak_load_module(const struct module *mod, |
2418 | const struct load_info *info) | |
4f2294b6 CM |
2419 | { |
2420 | unsigned int i; | |
2421 | ||
2422 | /* only scan the sections containing data */ | |
c017b4be | 2423 | kmemleak_scan_area(mod, sizeof(struct module), GFP_KERNEL); |
4f2294b6 | 2424 | |
49668688 RR |
2425 | for (i = 1; i < info->hdr->e_shnum; i++) { |
2426 | const char *name = info->secstrings + info->sechdrs[i].sh_name; | |
2427 | if (!(info->sechdrs[i].sh_flags & SHF_ALLOC)) | |
4f2294b6 | 2428 | continue; |
49668688 | 2429 | if (!strstarts(name, ".data") && !strstarts(name, ".bss")) |
4f2294b6 CM |
2430 | continue; |
2431 | ||
49668688 RR |
2432 | kmemleak_scan_area((void *)info->sechdrs[i].sh_addr, |
2433 | info->sechdrs[i].sh_size, GFP_KERNEL); | |
4f2294b6 CM |
2434 | } |
2435 | } | |
2436 | #else | |
49668688 RR |
2437 | static inline void kmemleak_load_module(const struct module *mod, |
2438 | const struct load_info *info) | |
4f2294b6 CM |
2439 | { |
2440 | } | |
2441 | #endif | |
2442 | ||
106a4ee2 | 2443 | #ifdef CONFIG_MODULE_SIG |
34e1169d | 2444 | static int module_sig_check(struct load_info *info) |
106a4ee2 RR |
2445 | { |
2446 | int err = -ENOKEY; | |
34e1169d KC |
2447 | const unsigned long markerlen = sizeof(MODULE_SIG_STRING) - 1; |
2448 | const void *mod = info->hdr; | |
caabe240 | 2449 | |
34e1169d KC |
2450 | if (info->len > markerlen && |
2451 | memcmp(mod + info->len - markerlen, MODULE_SIG_STRING, markerlen) == 0) { | |
caabe240 | 2452 | /* We truncate the module to discard the signature */ |
34e1169d KC |
2453 | info->len -= markerlen; |
2454 | err = mod_verify_sig(mod, &info->len); | |
106a4ee2 RR |
2455 | } |
2456 | ||
2457 | if (!err) { | |
2458 | info->sig_ok = true; | |
2459 | return 0; | |
2460 | } | |
2461 | ||
2462 | /* Not having a signature is only an error if we're strict. */ | |
1d0059f3 DH |
2463 | if (err < 0 && fips_enabled) |
2464 | panic("Module verification failed with error %d in FIPS mode\n", | |
2465 | err); | |
106a4ee2 RR |
2466 | if (err == -ENOKEY && !sig_enforce) |
2467 | err = 0; | |
2468 | ||
2469 | return err; | |
2470 | } | |
2471 | #else /* !CONFIG_MODULE_SIG */ | |
34e1169d | 2472 | static int module_sig_check(struct load_info *info) |
106a4ee2 RR |
2473 | { |
2474 | return 0; | |
2475 | } | |
2476 | #endif /* !CONFIG_MODULE_SIG */ | |
2477 | ||
34e1169d KC |
2478 | /* Sanity checks against invalid binaries, wrong arch, weird elf version. */ |
2479 | static int elf_header_check(struct load_info *info) | |
40dd2560 | 2480 | { |
34e1169d KC |
2481 | if (info->len < sizeof(*(info->hdr))) |
2482 | return -ENOEXEC; | |
2483 | ||
2484 | if (memcmp(info->hdr->e_ident, ELFMAG, SELFMAG) != 0 | |
2485 | || info->hdr->e_type != ET_REL | |
2486 | || !elf_check_arch(info->hdr) | |
2487 | || info->hdr->e_shentsize != sizeof(Elf_Shdr)) | |
2488 | return -ENOEXEC; | |
2489 | ||
2490 | if (info->hdr->e_shoff >= info->len | |
2491 | || (info->hdr->e_shnum * sizeof(Elf_Shdr) > | |
2492 | info->len - info->hdr->e_shoff)) | |
2493 | return -ENOEXEC; | |
40dd2560 | 2494 | |
34e1169d KC |
2495 | return 0; |
2496 | } | |
2497 | ||
2498 | /* Sets info->hdr and info->len. */ | |
2499 | static int copy_module_from_user(const void __user *umod, unsigned long len, | |
2500 | struct load_info *info) | |
40dd2560 RR |
2501 | { |
2502 | int err; | |
40dd2560 | 2503 | |
34e1169d KC |
2504 | info->len = len; |
2505 | if (info->len < sizeof(*(info->hdr))) | |
40dd2560 RR |
2506 | return -ENOEXEC; |
2507 | ||
2e72d51b KC |
2508 | err = security_kernel_module_from_file(NULL); |
2509 | if (err) | |
2510 | return err; | |
2511 | ||
40dd2560 | 2512 | /* Suck in entire file: we'll want most of it. */ |
34e1169d KC |
2513 | info->hdr = vmalloc(info->len); |
2514 | if (!info->hdr) | |
40dd2560 RR |
2515 | return -ENOMEM; |
2516 | ||
34e1169d KC |
2517 | if (copy_from_user(info->hdr, umod, info->len) != 0) { |
2518 | vfree(info->hdr); | |
2519 | return -EFAULT; | |
40dd2560 RR |
2520 | } |
2521 | ||
34e1169d KC |
2522 | return 0; |
2523 | } | |
2524 | ||
2525 | /* Sets info->hdr and info->len. */ | |
2526 | static int copy_module_from_fd(int fd, struct load_info *info) | |
2527 | { | |
2528 | struct file *file; | |
2529 | int err; | |
2530 | struct kstat stat; | |
2531 | loff_t pos; | |
2532 | ssize_t bytes = 0; | |
2533 | ||
2534 | file = fget(fd); | |
2535 | if (!file) | |
2536 | return -ENOEXEC; | |
2537 | ||
2e72d51b | 2538 | err = security_kernel_module_from_file(file); |
106a4ee2 | 2539 | if (err) |
2e72d51b | 2540 | goto out; |
106a4ee2 | 2541 | |
34e1169d | 2542 | err = vfs_getattr(file->f_vfsmnt, file->f_dentry, &stat); |
106a4ee2 | 2543 | if (err) |
34e1169d | 2544 | goto out; |
40dd2560 | 2545 | |
34e1169d KC |
2546 | if (stat.size > INT_MAX) { |
2547 | err = -EFBIG; | |
2548 | goto out; | |
40dd2560 | 2549 | } |
52441fa8 SL |
2550 | |
2551 | /* Don't hand 0 to vmalloc, it whines. */ | |
2552 | if (stat.size == 0) { | |
2553 | err = -EINVAL; | |
2554 | goto out; | |
2555 | } | |
2556 | ||
34e1169d KC |
2557 | info->hdr = vmalloc(stat.size); |
2558 | if (!info->hdr) { | |
2559 | err = -ENOMEM; | |
2560 | goto out; | |
40dd2560 | 2561 | } |
d913188c | 2562 | |
34e1169d KC |
2563 | pos = 0; |
2564 | while (pos < stat.size) { | |
2565 | bytes = kernel_read(file, pos, (char *)(info->hdr) + pos, | |
2566 | stat.size - pos); | |
2567 | if (bytes < 0) { | |
2568 | vfree(info->hdr); | |
2569 | err = bytes; | |
2570 | goto out; | |
2571 | } | |
2572 | if (bytes == 0) | |
2573 | break; | |
2574 | pos += bytes; | |
2575 | } | |
2576 | info->len = pos; | |
40dd2560 | 2577 | |
34e1169d KC |
2578 | out: |
2579 | fput(file); | |
40dd2560 RR |
2580 | return err; |
2581 | } | |
2582 | ||
d913188c RR |
2583 | static void free_copy(struct load_info *info) |
2584 | { | |
d913188c RR |
2585 | vfree(info->hdr); |
2586 | } | |
2587 | ||
2f3238ae | 2588 | static int rewrite_section_headers(struct load_info *info, int flags) |
8b5f61a7 RR |
2589 | { |
2590 | unsigned int i; | |
2591 | ||
2592 | /* This should always be true, but let's be sure. */ | |
2593 | info->sechdrs[0].sh_addr = 0; | |
2594 | ||
2595 | for (i = 1; i < info->hdr->e_shnum; i++) { | |
2596 | Elf_Shdr *shdr = &info->sechdrs[i]; | |
2597 | if (shdr->sh_type != SHT_NOBITS | |
2598 | && info->len < shdr->sh_offset + shdr->sh_size) { | |
2599 | printk(KERN_ERR "Module len %lu truncated\n", | |
2600 | info->len); | |
2601 | return -ENOEXEC; | |
2602 | } | |
2603 | ||
2604 | /* Mark all sections sh_addr with their address in the | |
2605 | temporary image. */ | |
2606 | shdr->sh_addr = (size_t)info->hdr + shdr->sh_offset; | |
2607 | ||
2608 | #ifndef CONFIG_MODULE_UNLOAD | |
2609 | /* Don't load .exit sections */ | |
2610 | if (strstarts(info->secstrings+shdr->sh_name, ".exit")) | |
2611 | shdr->sh_flags &= ~(unsigned long)SHF_ALLOC; | |
2612 | #endif | |
8b5f61a7 | 2613 | } |
d6df72a0 RR |
2614 | |
2615 | /* Track but don't keep modinfo and version sections. */ | |
2f3238ae RR |
2616 | if (flags & MODULE_INIT_IGNORE_MODVERSIONS) |
2617 | info->index.vers = 0; /* Pretend no __versions section! */ | |
2618 | else | |
2619 | info->index.vers = find_sec(info, "__versions"); | |
49668688 | 2620 | info->index.info = find_sec(info, ".modinfo"); |
d6df72a0 RR |
2621 | info->sechdrs[info->index.info].sh_flags &= ~(unsigned long)SHF_ALLOC; |
2622 | info->sechdrs[info->index.vers].sh_flags &= ~(unsigned long)SHF_ALLOC; | |
8b5f61a7 RR |
2623 | return 0; |
2624 | } | |
2625 | ||
3264d3f9 LT |
2626 | /* |
2627 | * Set up our basic convenience variables (pointers to section headers, | |
2628 | * search for module section index etc), and do some basic section | |
2629 | * verification. | |
2630 | * | |
2631 | * Return the temporary module pointer (we'll replace it with the final | |
2632 | * one when we move the module sections around). | |
2633 | */ | |
2f3238ae | 2634 | static struct module *setup_load_info(struct load_info *info, int flags) |
3264d3f9 LT |
2635 | { |
2636 | unsigned int i; | |
8b5f61a7 | 2637 | int err; |
3264d3f9 LT |
2638 | struct module *mod; |
2639 | ||
2640 | /* Set up the convenience variables */ | |
2641 | info->sechdrs = (void *)info->hdr + info->hdr->e_shoff; | |
8b5f61a7 RR |
2642 | info->secstrings = (void *)info->hdr |
2643 | + info->sechdrs[info->hdr->e_shstrndx].sh_offset; | |
3264d3f9 | 2644 | |
2f3238ae | 2645 | err = rewrite_section_headers(info, flags); |
8b5f61a7 RR |
2646 | if (err) |
2647 | return ERR_PTR(err); | |
3264d3f9 | 2648 | |
8b5f61a7 RR |
2649 | /* Find internal symbols and strings. */ |
2650 | for (i = 1; i < info->hdr->e_shnum; i++) { | |
3264d3f9 LT |
2651 | if (info->sechdrs[i].sh_type == SHT_SYMTAB) { |
2652 | info->index.sym = i; | |
2653 | info->index.str = info->sechdrs[i].sh_link; | |
8b5f61a7 RR |
2654 | info->strtab = (char *)info->hdr |
2655 | + info->sechdrs[info->index.str].sh_offset; | |
2656 | break; | |
3264d3f9 | 2657 | } |
3264d3f9 LT |
2658 | } |
2659 | ||
49668688 | 2660 | info->index.mod = find_sec(info, ".gnu.linkonce.this_module"); |
3264d3f9 LT |
2661 | if (!info->index.mod) { |
2662 | printk(KERN_WARNING "No module found in object\n"); | |
2663 | return ERR_PTR(-ENOEXEC); | |
2664 | } | |
2665 | /* This is temporary: point mod into copy of data. */ | |
2666 | mod = (void *)info->sechdrs[info->index.mod].sh_addr; | |
2667 | ||
2668 | if (info->index.sym == 0) { | |
2669 | printk(KERN_WARNING "%s: module has no symbols (stripped?)\n", | |
2670 | mod->name); | |
2671 | return ERR_PTR(-ENOEXEC); | |
2672 | } | |
2673 | ||
49668688 | 2674 | info->index.pcpu = find_pcpusec(info); |
3264d3f9 | 2675 | |
3264d3f9 LT |
2676 | /* Check module struct version now, before we try to use module. */ |
2677 | if (!check_modstruct_version(info->sechdrs, info->index.vers, mod)) | |
2678 | return ERR_PTR(-ENOEXEC); | |
2679 | ||
2680 | return mod; | |
3264d3f9 LT |
2681 | } |
2682 | ||
2f3238ae | 2683 | static int check_modinfo(struct module *mod, struct load_info *info, int flags) |
40dd2560 | 2684 | { |
49668688 | 2685 | const char *modmagic = get_modinfo(info, "vermagic"); |
40dd2560 RR |
2686 | int err; |
2687 | ||
2f3238ae RR |
2688 | if (flags & MODULE_INIT_IGNORE_VERMAGIC) |
2689 | modmagic = NULL; | |
2690 | ||
40dd2560 RR |
2691 | /* This is allowed: modprobe --force will invalidate it. */ |
2692 | if (!modmagic) { | |
2693 | err = try_to_force_load(mod, "bad vermagic"); | |
2694 | if (err) | |
2695 | return err; | |
49668688 | 2696 | } else if (!same_magic(modmagic, vermagic, info->index.vers)) { |
40dd2560 RR |
2697 | printk(KERN_ERR "%s: version magic '%s' should be '%s'\n", |
2698 | mod->name, modmagic, vermagic); | |
2699 | return -ENOEXEC; | |
2700 | } | |
2701 | ||
2449b8ba BH |
2702 | if (!get_modinfo(info, "intree")) |
2703 | add_taint_module(mod, TAINT_OOT_MODULE); | |
2704 | ||
49668688 | 2705 | if (get_modinfo(info, "staging")) { |
40dd2560 RR |
2706 | add_taint_module(mod, TAINT_CRAP); |
2707 | printk(KERN_WARNING "%s: module is from the staging directory," | |
2708 | " the quality is unknown, you have been warned.\n", | |
2709 | mod->name); | |
2710 | } | |
22e268eb RR |
2711 | |
2712 | /* Set up license info based on the info section */ | |
49668688 | 2713 | set_license(mod, get_modinfo(info, "license")); |
22e268eb | 2714 | |
40dd2560 RR |
2715 | return 0; |
2716 | } | |
2717 | ||
811d66a0 | 2718 | static void find_module_sections(struct module *mod, struct load_info *info) |
f91a13bb | 2719 | { |
49668688 | 2720 | mod->kp = section_objs(info, "__param", |
f91a13bb | 2721 | sizeof(*mod->kp), &mod->num_kp); |
49668688 | 2722 | mod->syms = section_objs(info, "__ksymtab", |
f91a13bb | 2723 | sizeof(*mod->syms), &mod->num_syms); |
49668688 RR |
2724 | mod->crcs = section_addr(info, "__kcrctab"); |
2725 | mod->gpl_syms = section_objs(info, "__ksymtab_gpl", | |
f91a13bb LT |
2726 | sizeof(*mod->gpl_syms), |
2727 | &mod->num_gpl_syms); | |
49668688 RR |
2728 | mod->gpl_crcs = section_addr(info, "__kcrctab_gpl"); |
2729 | mod->gpl_future_syms = section_objs(info, | |
f91a13bb LT |
2730 | "__ksymtab_gpl_future", |
2731 | sizeof(*mod->gpl_future_syms), | |
2732 | &mod->num_gpl_future_syms); | |
49668688 | 2733 | mod->gpl_future_crcs = section_addr(info, "__kcrctab_gpl_future"); |
f91a13bb LT |
2734 | |
2735 | #ifdef CONFIG_UNUSED_SYMBOLS | |
49668688 | 2736 | mod->unused_syms = section_objs(info, "__ksymtab_unused", |
f91a13bb LT |
2737 | sizeof(*mod->unused_syms), |
2738 | &mod->num_unused_syms); | |
49668688 RR |
2739 | mod->unused_crcs = section_addr(info, "__kcrctab_unused"); |
2740 | mod->unused_gpl_syms = section_objs(info, "__ksymtab_unused_gpl", | |
f91a13bb LT |
2741 | sizeof(*mod->unused_gpl_syms), |
2742 | &mod->num_unused_gpl_syms); | |
49668688 | 2743 | mod->unused_gpl_crcs = section_addr(info, "__kcrctab_unused_gpl"); |
f91a13bb LT |
2744 | #endif |
2745 | #ifdef CONFIG_CONSTRUCTORS | |
49668688 | 2746 | mod->ctors = section_objs(info, ".ctors", |
f91a13bb LT |
2747 | sizeof(*mod->ctors), &mod->num_ctors); |
2748 | #endif | |
2749 | ||
2750 | #ifdef CONFIG_TRACEPOINTS | |
65498646 MD |
2751 | mod->tracepoints_ptrs = section_objs(info, "__tracepoints_ptrs", |
2752 | sizeof(*mod->tracepoints_ptrs), | |
2753 | &mod->num_tracepoints); | |
f91a13bb | 2754 | #endif |
bf5438fc JB |
2755 | #ifdef HAVE_JUMP_LABEL |
2756 | mod->jump_entries = section_objs(info, "__jump_table", | |
2757 | sizeof(*mod->jump_entries), | |
2758 | &mod->num_jump_entries); | |
2759 | #endif | |
f91a13bb | 2760 | #ifdef CONFIG_EVENT_TRACING |
49668688 | 2761 | mod->trace_events = section_objs(info, "_ftrace_events", |
f91a13bb LT |
2762 | sizeof(*mod->trace_events), |
2763 | &mod->num_trace_events); | |
2764 | /* | |
2765 | * This section contains pointers to allocated objects in the trace | |
2766 | * code and not scanning it leads to false positives. | |
2767 | */ | |
2768 | kmemleak_scan_area(mod->trace_events, sizeof(*mod->trace_events) * | |
2769 | mod->num_trace_events, GFP_KERNEL); | |
2770 | #endif | |
13b9b6e7 SR |
2771 | #ifdef CONFIG_TRACING |
2772 | mod->trace_bprintk_fmt_start = section_objs(info, "__trace_printk_fmt", | |
2773 | sizeof(*mod->trace_bprintk_fmt_start), | |
2774 | &mod->num_trace_bprintk_fmt); | |
2775 | /* | |
2776 | * This section contains pointers to allocated objects in the trace | |
2777 | * code and not scanning it leads to false positives. | |
2778 | */ | |
2779 | kmemleak_scan_area(mod->trace_bprintk_fmt_start, | |
2780 | sizeof(*mod->trace_bprintk_fmt_start) * | |
2781 | mod->num_trace_bprintk_fmt, GFP_KERNEL); | |
2782 | #endif | |
f91a13bb LT |
2783 | #ifdef CONFIG_FTRACE_MCOUNT_RECORD |
2784 | /* sechdrs[0].sh_size is always zero */ | |
49668688 | 2785 | mod->ftrace_callsites = section_objs(info, "__mcount_loc", |
f91a13bb LT |
2786 | sizeof(*mod->ftrace_callsites), |
2787 | &mod->num_ftrace_callsites); | |
2788 | #endif | |
22e268eb | 2789 | |
811d66a0 RR |
2790 | mod->extable = section_objs(info, "__ex_table", |
2791 | sizeof(*mod->extable), &mod->num_exentries); | |
2792 | ||
49668688 | 2793 | if (section_addr(info, "__obsparm")) |
22e268eb RR |
2794 | printk(KERN_WARNING "%s: Ignoring obsolete parameters\n", |
2795 | mod->name); | |
811d66a0 RR |
2796 | |
2797 | info->debug = section_objs(info, "__verbose", | |
2798 | sizeof(*info->debug), &info->num_debug); | |
f91a13bb LT |
2799 | } |
2800 | ||
49668688 | 2801 | static int move_module(struct module *mod, struct load_info *info) |
65b8a9b4 LT |
2802 | { |
2803 | int i; | |
2804 | void *ptr; | |
2805 | ||
2806 | /* Do the allocs. */ | |
2807 | ptr = module_alloc_update_bounds(mod->core_size); | |
2808 | /* | |
2809 | * The pointer to this block is stored in the module structure | |
2810 | * which is inside the block. Just mark it as not being a | |
2811 | * leak. | |
2812 | */ | |
2813 | kmemleak_not_leak(ptr); | |
2814 | if (!ptr) | |
d913188c | 2815 | return -ENOMEM; |
65b8a9b4 LT |
2816 | |
2817 | memset(ptr, 0, mod->core_size); | |
2818 | mod->module_core = ptr; | |
2819 | ||
82fab442 RR |
2820 | if (mod->init_size) { |
2821 | ptr = module_alloc_update_bounds(mod->init_size); | |
2822 | /* | |
2823 | * The pointer to this block is stored in the module structure | |
2824 | * which is inside the block. This block doesn't need to be | |
2825 | * scanned as it contains data and code that will be freed | |
2826 | * after the module is initialized. | |
2827 | */ | |
2828 | kmemleak_ignore(ptr); | |
2829 | if (!ptr) { | |
2830 | module_free(mod, mod->module_core); | |
2831 | return -ENOMEM; | |
2832 | } | |
2833 | memset(ptr, 0, mod->init_size); | |
2834 | mod->module_init = ptr; | |
2835 | } else | |
2836 | mod->module_init = NULL; | |
65b8a9b4 LT |
2837 | |
2838 | /* Transfer each section which specifies SHF_ALLOC */ | |
5e124169 | 2839 | pr_debug("final section addresses:\n"); |
49668688 | 2840 | for (i = 0; i < info->hdr->e_shnum; i++) { |
65b8a9b4 | 2841 | void *dest; |
49668688 | 2842 | Elf_Shdr *shdr = &info->sechdrs[i]; |
65b8a9b4 | 2843 | |
49668688 | 2844 | if (!(shdr->sh_flags & SHF_ALLOC)) |
65b8a9b4 LT |
2845 | continue; |
2846 | ||
49668688 | 2847 | if (shdr->sh_entsize & INIT_OFFSET_MASK) |
65b8a9b4 | 2848 | dest = mod->module_init |
49668688 | 2849 | + (shdr->sh_entsize & ~INIT_OFFSET_MASK); |
65b8a9b4 | 2850 | else |
49668688 | 2851 | dest = mod->module_core + shdr->sh_entsize; |
65b8a9b4 | 2852 | |
49668688 RR |
2853 | if (shdr->sh_type != SHT_NOBITS) |
2854 | memcpy(dest, (void *)shdr->sh_addr, shdr->sh_size); | |
65b8a9b4 | 2855 | /* Update sh_addr to point to copy in image. */ |
49668688 | 2856 | shdr->sh_addr = (unsigned long)dest; |
5e124169 JC |
2857 | pr_debug("\t0x%lx %s\n", |
2858 | (long)shdr->sh_addr, info->secstrings + shdr->sh_name); | |
65b8a9b4 | 2859 | } |
d913188c RR |
2860 | |
2861 | return 0; | |
65b8a9b4 LT |
2862 | } |
2863 | ||
49668688 | 2864 | static int check_module_license_and_versions(struct module *mod) |
22e268eb RR |
2865 | { |
2866 | /* | |
2867 | * ndiswrapper is under GPL by itself, but loads proprietary modules. | |
2868 | * Don't use add_taint_module(), as it would prevent ndiswrapper from | |
2869 | * using GPL-only symbols it needs. | |
2870 | */ | |
2871 | if (strcmp(mod->name, "ndiswrapper") == 0) | |
2872 | add_taint(TAINT_PROPRIETARY_MODULE); | |
2873 | ||
2874 | /* driverloader was caught wrongly pretending to be under GPL */ | |
2875 | if (strcmp(mod->name, "driverloader") == 0) | |
2876 | add_taint_module(mod, TAINT_PROPRIETARY_MODULE); | |
2877 | ||
c99af375 MG |
2878 | /* lve claims to be GPL but upstream won't provide source */ |
2879 | if (strcmp(mod->name, "lve") == 0) | |
2880 | add_taint_module(mod, TAINT_PROPRIETARY_MODULE); | |
2881 | ||
22e268eb RR |
2882 | #ifdef CONFIG_MODVERSIONS |
2883 | if ((mod->num_syms && !mod->crcs) | |
2884 | || (mod->num_gpl_syms && !mod->gpl_crcs) | |
2885 | || (mod->num_gpl_future_syms && !mod->gpl_future_crcs) | |
2886 | #ifdef CONFIG_UNUSED_SYMBOLS | |
2887 | || (mod->num_unused_syms && !mod->unused_crcs) | |
2888 | || (mod->num_unused_gpl_syms && !mod->unused_gpl_crcs) | |
2889 | #endif | |
2890 | ) { | |
2891 | return try_to_force_load(mod, | |
2892 | "no versions for exported symbols"); | |
2893 | } | |
2894 | #endif | |
2895 | return 0; | |
2896 | } | |
2897 | ||
2898 | static void flush_module_icache(const struct module *mod) | |
2899 | { | |
2900 | mm_segment_t old_fs; | |
2901 | ||
2902 | /* flush the icache in correct context */ | |
2903 | old_fs = get_fs(); | |
2904 | set_fs(KERNEL_DS); | |
2905 | ||
2906 | /* | |
2907 | * Flush the instruction cache, since we've played with text. | |
2908 | * Do it before processing of module parameters, so the module | |
2909 | * can provide parameter accessor functions of its own. | |
2910 | */ | |
2911 | if (mod->module_init) | |
2912 | flush_icache_range((unsigned long)mod->module_init, | |
2913 | (unsigned long)mod->module_init | |
2914 | + mod->init_size); | |
2915 | flush_icache_range((unsigned long)mod->module_core, | |
2916 | (unsigned long)mod->module_core + mod->core_size); | |
2917 | ||
2918 | set_fs(old_fs); | |
2919 | } | |
2920 | ||
74e08fcf JB |
2921 | int __weak module_frob_arch_sections(Elf_Ehdr *hdr, |
2922 | Elf_Shdr *sechdrs, | |
2923 | char *secstrings, | |
2924 | struct module *mod) | |
2925 | { | |
2926 | return 0; | |
2927 | } | |
2928 | ||
2f3238ae | 2929 | static struct module *layout_and_allocate(struct load_info *info, int flags) |
1da177e4 | 2930 | { |
d913188c | 2931 | /* Module within temporary copy. */ |
1da177e4 | 2932 | struct module *mod; |
49668688 | 2933 | Elf_Shdr *pcpusec; |
d913188c | 2934 | int err; |
3ae91c21 | 2935 | |
2f3238ae | 2936 | mod = setup_load_info(info, flags); |
d913188c RR |
2937 | if (IS_ERR(mod)) |
2938 | return mod; | |
1da177e4 | 2939 | |
2f3238ae | 2940 | err = check_modinfo(mod, info, flags); |
40dd2560 RR |
2941 | if (err) |
2942 | return ERR_PTR(err); | |
1da177e4 | 2943 | |
1da177e4 | 2944 | /* Allow arches to frob section contents and sizes. */ |
49668688 RR |
2945 | err = module_frob_arch_sections(info->hdr, info->sechdrs, |
2946 | info->secstrings, mod); | |
1da177e4 | 2947 | if (err < 0) |
6526c534 | 2948 | goto out; |
1da177e4 | 2949 | |
49668688 RR |
2950 | pcpusec = &info->sechdrs[info->index.pcpu]; |
2951 | if (pcpusec->sh_size) { | |
1da177e4 | 2952 | /* We have a special allocation for this section. */ |
49668688 RR |
2953 | err = percpu_modalloc(mod, |
2954 | pcpusec->sh_size, pcpusec->sh_addralign); | |
259354de | 2955 | if (err) |
6526c534 | 2956 | goto out; |
49668688 | 2957 | pcpusec->sh_flags &= ~(unsigned long)SHF_ALLOC; |
1da177e4 LT |
2958 | } |
2959 | ||
2960 | /* Determine total sizes, and put offsets in sh_entsize. For now | |
2961 | this is done generically; there doesn't appear to be any | |
2962 | special cases for the architectures. */ | |
49668688 | 2963 | layout_sections(mod, info); |
49668688 | 2964 | layout_symtab(mod, info); |
1da177e4 | 2965 | |
65b8a9b4 | 2966 | /* Allocate and move to the final place */ |
49668688 | 2967 | err = move_module(mod, info); |
d913188c | 2968 | if (err) |
48fd1188 | 2969 | goto free_percpu; |
d913188c RR |
2970 | |
2971 | /* Module has been copied to its final place now: return it. */ | |
2972 | mod = (void *)info->sechdrs[info->index.mod].sh_addr; | |
49668688 | 2973 | kmemleak_load_module(mod, info); |
d913188c RR |
2974 | return mod; |
2975 | ||
d913188c RR |
2976 | free_percpu: |
2977 | percpu_modfree(mod); | |
6526c534 | 2978 | out: |
d913188c RR |
2979 | return ERR_PTR(err); |
2980 | } | |
2981 | ||
2982 | /* mod is no longer valid after this! */ | |
2983 | static void module_deallocate(struct module *mod, struct load_info *info) | |
2984 | { | |
d913188c RR |
2985 | percpu_modfree(mod); |
2986 | module_free(mod, mod->module_init); | |
2987 | module_free(mod, mod->module_core); | |
2988 | } | |
2989 | ||
74e08fcf JB |
2990 | int __weak module_finalize(const Elf_Ehdr *hdr, |
2991 | const Elf_Shdr *sechdrs, | |
2992 | struct module *me) | |
2993 | { | |
2994 | return 0; | |
2995 | } | |
2996 | ||
811d66a0 RR |
2997 | static int post_relocation(struct module *mod, const struct load_info *info) |
2998 | { | |
51f3d0f4 | 2999 | /* Sort exception table now relocations are done. */ |
811d66a0 RR |
3000 | sort_extable(mod->extable, mod->extable + mod->num_exentries); |
3001 | ||
3002 | /* Copy relocated percpu area over. */ | |
3003 | percpu_modcopy(mod, (void *)info->sechdrs[info->index.pcpu].sh_addr, | |
3004 | info->sechdrs[info->index.pcpu].sh_size); | |
3005 | ||
51f3d0f4 | 3006 | /* Setup kallsyms-specific fields. */ |
811d66a0 RR |
3007 | add_kallsyms(mod, info); |
3008 | ||
3009 | /* Arch-specific module finalizing. */ | |
3010 | return module_finalize(info->hdr, info->sechdrs, mod); | |
3011 | } | |
3012 | ||
9bb9c3be RR |
3013 | /* Is this module of this name done loading? No locks held. */ |
3014 | static bool finished_loading(const char *name) | |
3015 | { | |
3016 | struct module *mod; | |
3017 | bool ret; | |
3018 | ||
3019 | mutex_lock(&module_mutex); | |
1fb9341a | 3020 | mod = find_module_all(name, true); |
0d21b0e3 RR |
3021 | ret = !mod || mod->state == MODULE_STATE_LIVE |
3022 | || mod->state == MODULE_STATE_GOING; | |
9bb9c3be RR |
3023 | mutex_unlock(&module_mutex); |
3024 | ||
3025 | return ret; | |
3026 | } | |
3027 | ||
34e1169d KC |
3028 | /* Call module constructors. */ |
3029 | static void do_mod_ctors(struct module *mod) | |
3030 | { | |
3031 | #ifdef CONFIG_CONSTRUCTORS | |
3032 | unsigned long i; | |
3033 | ||
3034 | for (i = 0; i < mod->num_ctors; i++) | |
3035 | mod->ctors[i](); | |
3036 | #endif | |
3037 | } | |
3038 | ||
3039 | /* This is where the real work happens */ | |
3040 | static int do_init_module(struct module *mod) | |
3041 | { | |
3042 | int ret = 0; | |
3043 | ||
774a1221 TH |
3044 | /* |
3045 | * We want to find out whether @mod uses async during init. Clear | |
3046 | * PF_USED_ASYNC. async_schedule*() will set it. | |
3047 | */ | |
3048 | current->flags &= ~PF_USED_ASYNC; | |
3049 | ||
34e1169d KC |
3050 | blocking_notifier_call_chain(&module_notify_list, |
3051 | MODULE_STATE_COMING, mod); | |
3052 | ||
3053 | /* Set RO and NX regions for core */ | |
3054 | set_section_ro_nx(mod->module_core, | |
3055 | mod->core_text_size, | |
3056 | mod->core_ro_size, | |
3057 | mod->core_size); | |
3058 | ||
3059 | /* Set RO and NX regions for init */ | |
3060 | set_section_ro_nx(mod->module_init, | |
3061 | mod->init_text_size, | |
3062 | mod->init_ro_size, | |
3063 | mod->init_size); | |
3064 | ||
3065 | do_mod_ctors(mod); | |
3066 | /* Start the module */ | |
3067 | if (mod->init != NULL) | |
3068 | ret = do_one_initcall(mod->init); | |
3069 | if (ret < 0) { | |
3070 | /* Init routine failed: abort. Try to protect us from | |
3071 | buggy refcounters. */ | |
3072 | mod->state = MODULE_STATE_GOING; | |
3073 | synchronize_sched(); | |
3074 | module_put(mod); | |
3075 | blocking_notifier_call_chain(&module_notify_list, | |
3076 | MODULE_STATE_GOING, mod); | |
3077 | free_module(mod); | |
3078 | wake_up_all(&module_wq); | |
3079 | return ret; | |
3080 | } | |
3081 | if (ret > 0) { | |
3082 | printk(KERN_WARNING | |
3083 | "%s: '%s'->init suspiciously returned %d, it should follow 0/-E convention\n" | |
3084 | "%s: loading module anyway...\n", | |
3085 | __func__, mod->name, ret, | |
3086 | __func__); | |
3087 | dump_stack(); | |
3088 | } | |
3089 | ||
3090 | /* Now it's a first class citizen! */ | |
3091 | mod->state = MODULE_STATE_LIVE; | |
3092 | blocking_notifier_call_chain(&module_notify_list, | |
3093 | MODULE_STATE_LIVE, mod); | |
3094 | ||
774a1221 TH |
3095 | /* |
3096 | * We need to finish all async code before the module init sequence | |
3097 | * is done. This has potential to deadlock. For example, a newly | |
3098 | * detected block device can trigger request_module() of the | |
3099 | * default iosched from async probing task. Once userland helper | |
3100 | * reaches here, async_synchronize_full() will wait on the async | |
3101 | * task waiting on request_module() and deadlock. | |
3102 | * | |
3103 | * This deadlock is avoided by perfomring async_synchronize_full() | |
3104 | * iff module init queued any async jobs. This isn't a full | |
3105 | * solution as it will deadlock the same if module loading from | |
3106 | * async jobs nests more than once; however, due to the various | |
3107 | * constraints, this hack seems to be the best option for now. | |
3108 | * Please refer to the following thread for details. | |
3109 | * | |
3110 | * http://thread.gmane.org/gmane.linux.kernel/1420814 | |
3111 | */ | |
3112 | if (current->flags & PF_USED_ASYNC) | |
3113 | async_synchronize_full(); | |
34e1169d KC |
3114 | |
3115 | mutex_lock(&module_mutex); | |
3116 | /* Drop initial reference. */ | |
3117 | module_put(mod); | |
3118 | trim_init_extable(mod); | |
3119 | #ifdef CONFIG_KALLSYMS | |
3120 | mod->num_symtab = mod->core_num_syms; | |
3121 | mod->symtab = mod->core_symtab; | |
3122 | mod->strtab = mod->core_strtab; | |
3123 | #endif | |
3124 | unset_module_init_ro_nx(mod); | |
3125 | module_free(mod, mod->module_init); | |
3126 | mod->module_init = NULL; | |
3127 | mod->init_size = 0; | |
3128 | mod->init_ro_size = 0; | |
3129 | mod->init_text_size = 0; | |
3130 | mutex_unlock(&module_mutex); | |
3131 | wake_up_all(&module_wq); | |
3132 | ||
3133 | return 0; | |
3134 | } | |
3135 | ||
3136 | static int may_init_module(void) | |
3137 | { | |
3138 | if (!capable(CAP_SYS_MODULE) || modules_disabled) | |
3139 | return -EPERM; | |
3140 | ||
3141 | return 0; | |
3142 | } | |
3143 | ||
d913188c RR |
3144 | /* Allocate and load the module: note that size of section 0 is always |
3145 | zero, and we rely on this for optional sections. */ | |
2f3238ae RR |
3146 | static int load_module(struct load_info *info, const char __user *uargs, |
3147 | int flags) | |
d913188c | 3148 | { |
9bb9c3be | 3149 | struct module *mod, *old; |
d913188c | 3150 | long err; |
d913188c | 3151 | |
34e1169d KC |
3152 | err = module_sig_check(info); |
3153 | if (err) | |
3154 | goto free_copy; | |
d913188c | 3155 | |
34e1169d | 3156 | err = elf_header_check(info); |
d913188c | 3157 | if (err) |
34e1169d | 3158 | goto free_copy; |
d913188c RR |
3159 | |
3160 | /* Figure out module layout, and allocate all the memory. */ | |
2f3238ae | 3161 | mod = layout_and_allocate(info, flags); |
65b8a9b4 LT |
3162 | if (IS_ERR(mod)) { |
3163 | err = PTR_ERR(mod); | |
d913188c | 3164 | goto free_copy; |
1da177e4 | 3165 | } |
1da177e4 | 3166 | |
1fb9341a RR |
3167 | /* |
3168 | * We try to place it in the list now to make sure it's unique | |
3169 | * before we dedicate too many resources. In particular, | |
3170 | * temporary percpu memory exhaustion. | |
3171 | */ | |
3172 | mod->state = MODULE_STATE_UNFORMED; | |
3173 | again: | |
3174 | mutex_lock(&module_mutex); | |
3175 | if ((old = find_module_all(mod->name, true)) != NULL) { | |
3176 | if (old->state == MODULE_STATE_COMING | |
3177 | || old->state == MODULE_STATE_UNFORMED) { | |
3178 | /* Wait in case it fails to load. */ | |
3179 | mutex_unlock(&module_mutex); | |
3180 | err = wait_event_interruptible(module_wq, | |
3181 | finished_loading(mod->name)); | |
3182 | if (err) | |
3183 | goto free_module; | |
3184 | goto again; | |
3185 | } | |
3186 | err = -EEXIST; | |
3187 | mutex_unlock(&module_mutex); | |
3188 | goto free_module; | |
3189 | } | |
3190 | list_add_rcu(&mod->list, &modules); | |
3191 | mutex_unlock(&module_mutex); | |
3192 | ||
106a4ee2 | 3193 | #ifdef CONFIG_MODULE_SIG |
34e1169d | 3194 | mod->sig_ok = info->sig_ok; |
106a4ee2 RR |
3195 | if (!mod->sig_ok) |
3196 | add_taint_module(mod, TAINT_FORCED_MODULE); | |
3197 | #endif | |
3198 | ||
49668688 | 3199 | /* Now module is in final location, initialize linked lists, etc. */ |
9f85a4bb RR |
3200 | err = module_unload_init(mod); |
3201 | if (err) | |
1fb9341a | 3202 | goto unlink_mod; |
1da177e4 | 3203 | |
22e268eb RR |
3204 | /* Now we've got everything in the final locations, we can |
3205 | * find optional sections. */ | |
34e1169d | 3206 | find_module_sections(mod, info); |
9b37ccfc | 3207 | |
49668688 | 3208 | err = check_module_license_and_versions(mod); |
22e268eb RR |
3209 | if (err) |
3210 | goto free_unload; | |
9841d61d | 3211 | |
c988d2b2 | 3212 | /* Set up MODINFO_ATTR fields */ |
34e1169d | 3213 | setup_modinfo(mod, info); |
c988d2b2 | 3214 | |
1da177e4 | 3215 | /* Fix up syms, so that st_value is a pointer to location. */ |
34e1169d | 3216 | err = simplify_symbols(mod, info); |
1da177e4 | 3217 | if (err < 0) |
d913188c | 3218 | goto free_modinfo; |
1da177e4 | 3219 | |
34e1169d | 3220 | err = apply_relocations(mod, info); |
22e268eb | 3221 | if (err < 0) |
d913188c | 3222 | goto free_modinfo; |
1da177e4 | 3223 | |
34e1169d | 3224 | err = post_relocation(mod, info); |
1da177e4 | 3225 | if (err < 0) |
d913188c | 3226 | goto free_modinfo; |
1da177e4 | 3227 | |
22e268eb | 3228 | flush_module_icache(mod); |
378bac82 | 3229 | |
6526c534 RR |
3230 | /* Now copy in args */ |
3231 | mod->args = strndup_user(uargs, ~0UL >> 1); | |
3232 | if (IS_ERR(mod->args)) { | |
3233 | err = PTR_ERR(mod->args); | |
3234 | goto free_arch_cleanup; | |
3235 | } | |
8d3b33f6 | 3236 | |
34e1169d | 3237 | dynamic_debug_setup(info->debug, info->num_debug); |
ff49d74a | 3238 | |
1fb9341a RR |
3239 | mutex_lock(&module_mutex); |
3240 | /* Find duplicate symbols (must be called under lock). */ | |
be593f4c RR |
3241 | err = verify_export_symbols(mod); |
3242 | if (err < 0) | |
1fb9341a | 3243 | goto ddebug_cleanup; |
be593f4c | 3244 | |
1fb9341a | 3245 | /* This relies on module_mutex for list integrity. */ |
34e1169d | 3246 | module_bug_finalize(info->hdr, info->sechdrs, mod); |
1fb9341a RR |
3247 | |
3248 | /* Mark state as coming so strong_try_module_get() ignores us, | |
3249 | * but kallsyms etc. can see us. */ | |
3250 | mod->state = MODULE_STATE_COMING; | |
3251 | ||
75676500 | 3252 | mutex_unlock(&module_mutex); |
bb9d3d56 | 3253 | |
51f3d0f4 | 3254 | /* Module is ready to execute: parsing args may do that. */ |
026cee00 | 3255 | err = parse_args(mod->name, mod->args, mod->kp, mod->num_kp, |
b48420c1 | 3256 | -32768, 32767, &ddebug_dyndbg_module_param_cb); |
1da177e4 | 3257 | if (err < 0) |
1fb9341a | 3258 | goto bug_cleanup; |
1da177e4 | 3259 | |
51f3d0f4 | 3260 | /* Link in to syfs. */ |
34e1169d | 3261 | err = mod_sysfs_setup(mod, info, mod->kp, mod->num_kp); |
1da177e4 | 3262 | if (err < 0) |
1fb9341a | 3263 | goto bug_cleanup; |
80a3d1bb | 3264 | |
48fd1188 | 3265 | /* Get rid of temporary copy. */ |
34e1169d | 3266 | free_copy(info); |
1da177e4 LT |
3267 | |
3268 | /* Done! */ | |
51f3d0f4 | 3269 | trace_module_load(mod); |
34e1169d KC |
3270 | |
3271 | return do_init_module(mod); | |
1da177e4 | 3272 | |
1fb9341a RR |
3273 | bug_cleanup: |
3274 | /* module_bug_cleanup needs module_mutex protection */ | |
75676500 | 3275 | mutex_lock(&module_mutex); |
5336377d | 3276 | module_bug_cleanup(mod); |
1fb9341a | 3277 | ddebug_cleanup: |
ee61abb3 | 3278 | mutex_unlock(&module_mutex); |
1fb9341a | 3279 | dynamic_debug_remove(info->debug); |
e91defa2 | 3280 | synchronize_sched(); |
6526c534 RR |
3281 | kfree(mod->args); |
3282 | free_arch_cleanup: | |
1da177e4 | 3283 | module_arch_cleanup(mod); |
d913188c | 3284 | free_modinfo: |
a263f776 | 3285 | free_modinfo(mod); |
22e268eb | 3286 | free_unload: |
1da177e4 | 3287 | module_unload_free(mod); |
1fb9341a RR |
3288 | unlink_mod: |
3289 | mutex_lock(&module_mutex); | |
3290 | /* Unlink carefully: kallsyms could be walking list. */ | |
3291 | list_del_rcu(&mod->list); | |
3292 | wake_up_all(&module_wq); | |
3293 | mutex_unlock(&module_mutex); | |
d913188c | 3294 | free_module: |
34e1169d | 3295 | module_deallocate(mod, info); |
d913188c | 3296 | free_copy: |
34e1169d KC |
3297 | free_copy(info); |
3298 | return err; | |
b99b87f7 PO |
3299 | } |
3300 | ||
17da2bd9 HC |
3301 | SYSCALL_DEFINE3(init_module, void __user *, umod, |
3302 | unsigned long, len, const char __user *, uargs) | |
1da177e4 | 3303 | { |
34e1169d KC |
3304 | int err; |
3305 | struct load_info info = { }; | |
1da177e4 | 3306 | |
34e1169d KC |
3307 | err = may_init_module(); |
3308 | if (err) | |
3309 | return err; | |
1da177e4 | 3310 | |
34e1169d KC |
3311 | pr_debug("init_module: umod=%p, len=%lu, uargs=%p\n", |
3312 | umod, len, uargs); | |
1da177e4 | 3313 | |
34e1169d KC |
3314 | err = copy_module_from_user(umod, len, &info); |
3315 | if (err) | |
3316 | return err; | |
1da177e4 | 3317 | |
2f3238ae | 3318 | return load_module(&info, uargs, 0); |
34e1169d | 3319 | } |
94462ad3 | 3320 | |
2f3238ae | 3321 | SYSCALL_DEFINE3(finit_module, int, fd, const char __user *, uargs, int, flags) |
34e1169d KC |
3322 | { |
3323 | int err; | |
3324 | struct load_info info = { }; | |
94462ad3 | 3325 | |
34e1169d KC |
3326 | err = may_init_module(); |
3327 | if (err) | |
3328 | return err; | |
1da177e4 | 3329 | |
2f3238ae | 3330 | pr_debug("finit_module: fd=%d, uargs=%p, flags=%i\n", fd, uargs, flags); |
6c5db22d | 3331 | |
2f3238ae RR |
3332 | if (flags & ~(MODULE_INIT_IGNORE_MODVERSIONS |
3333 | |MODULE_INIT_IGNORE_VERMAGIC)) | |
3334 | return -EINVAL; | |
d6de2c80 | 3335 | |
34e1169d KC |
3336 | err = copy_module_from_fd(fd, &info); |
3337 | if (err) | |
3338 | return err; | |
1da177e4 | 3339 | |
2f3238ae | 3340 | return load_module(&info, uargs, flags); |
1da177e4 LT |
3341 | } |
3342 | ||
3343 | static inline int within(unsigned long addr, void *start, unsigned long size) | |
3344 | { | |
3345 | return ((void *)addr >= start && (void *)addr < start + size); | |
3346 | } | |
3347 | ||
3348 | #ifdef CONFIG_KALLSYMS | |
3349 | /* | |
3350 | * This ignores the intensely annoying "mapping symbols" found | |
3351 | * in ARM ELF files: $a, $t and $d. | |
3352 | */ | |
3353 | static inline int is_arm_mapping_symbol(const char *str) | |
3354 | { | |
22a8bdeb | 3355 | return str[0] == '$' && strchr("atd", str[1]) |
1da177e4 LT |
3356 | && (str[2] == '\0' || str[2] == '.'); |
3357 | } | |
3358 | ||
3359 | static const char *get_ksymbol(struct module *mod, | |
3360 | unsigned long addr, | |
3361 | unsigned long *size, | |
3362 | unsigned long *offset) | |
3363 | { | |
3364 | unsigned int i, best = 0; | |
3365 | unsigned long nextval; | |
3366 | ||
3367 | /* At worse, next value is at end of module */ | |
a06f6211 | 3368 | if (within_module_init(addr, mod)) |
1da177e4 | 3369 | nextval = (unsigned long)mod->module_init+mod->init_text_size; |
22a8bdeb | 3370 | else |
1da177e4 LT |
3371 | nextval = (unsigned long)mod->module_core+mod->core_text_size; |
3372 | ||
25985edc | 3373 | /* Scan for closest preceding symbol, and next symbol. (ELF |
22a8bdeb | 3374 | starts real symbols at 1). */ |
1da177e4 LT |
3375 | for (i = 1; i < mod->num_symtab; i++) { |
3376 | if (mod->symtab[i].st_shndx == SHN_UNDEF) | |
3377 | continue; | |
3378 | ||
3379 | /* We ignore unnamed symbols: they're uninformative | |
3380 | * and inserted at a whim. */ | |
3381 | if (mod->symtab[i].st_value <= addr | |
3382 | && mod->symtab[i].st_value > mod->symtab[best].st_value | |
3383 | && *(mod->strtab + mod->symtab[i].st_name) != '\0' | |
3384 | && !is_arm_mapping_symbol(mod->strtab + mod->symtab[i].st_name)) | |
3385 | best = i; | |
3386 | if (mod->symtab[i].st_value > addr | |
3387 | && mod->symtab[i].st_value < nextval | |
3388 | && *(mod->strtab + mod->symtab[i].st_name) != '\0' | |
3389 | && !is_arm_mapping_symbol(mod->strtab + mod->symtab[i].st_name)) | |
3390 | nextval = mod->symtab[i].st_value; | |
3391 | } | |
3392 | ||
3393 | if (!best) | |
3394 | return NULL; | |
3395 | ||
ffb45122 AD |
3396 | if (size) |
3397 | *size = nextval - mod->symtab[best].st_value; | |
3398 | if (offset) | |
3399 | *offset = addr - mod->symtab[best].st_value; | |
1da177e4 LT |
3400 | return mod->strtab + mod->symtab[best].st_name; |
3401 | } | |
3402 | ||
6dd06c9f RR |
3403 | /* For kallsyms to ask for address resolution. NULL means not found. Careful |
3404 | * not to lock to avoid deadlock on oopses, simply disable preemption. */ | |
92dfc9dc | 3405 | const char *module_address_lookup(unsigned long addr, |
6dd06c9f RR |
3406 | unsigned long *size, |
3407 | unsigned long *offset, | |
3408 | char **modname, | |
3409 | char *namebuf) | |
1da177e4 LT |
3410 | { |
3411 | struct module *mod; | |
cb2a5205 | 3412 | const char *ret = NULL; |
1da177e4 | 3413 | |
cb2a5205 | 3414 | preempt_disable(); |
d72b3751 | 3415 | list_for_each_entry_rcu(mod, &modules, list) { |
0d21b0e3 RR |
3416 | if (mod->state == MODULE_STATE_UNFORMED) |
3417 | continue; | |
a06f6211 MH |
3418 | if (within_module_init(addr, mod) || |
3419 | within_module_core(addr, mod)) { | |
ffc50891 FBH |
3420 | if (modname) |
3421 | *modname = mod->name; | |
cb2a5205 RR |
3422 | ret = get_ksymbol(mod, addr, size, offset); |
3423 | break; | |
1da177e4 LT |
3424 | } |
3425 | } | |
6dd06c9f RR |
3426 | /* Make a copy in here where it's safe */ |
3427 | if (ret) { | |
3428 | strncpy(namebuf, ret, KSYM_NAME_LEN - 1); | |
3429 | ret = namebuf; | |
3430 | } | |
cb2a5205 | 3431 | preempt_enable(); |
92dfc9dc | 3432 | return ret; |
1da177e4 LT |
3433 | } |
3434 | ||
9d65cb4a AD |
3435 | int lookup_module_symbol_name(unsigned long addr, char *symname) |
3436 | { | |
3437 | struct module *mod; | |
3438 | ||
cb2a5205 | 3439 | preempt_disable(); |
d72b3751 | 3440 | list_for_each_entry_rcu(mod, &modules, list) { |
0d21b0e3 RR |
3441 | if (mod->state == MODULE_STATE_UNFORMED) |
3442 | continue; | |
a06f6211 MH |
3443 | if (within_module_init(addr, mod) || |
3444 | within_module_core(addr, mod)) { | |
9d65cb4a AD |
3445 | const char *sym; |
3446 | ||
3447 | sym = get_ksymbol(mod, addr, NULL, NULL); | |
3448 | if (!sym) | |
3449 | goto out; | |
9281acea | 3450 | strlcpy(symname, sym, KSYM_NAME_LEN); |
cb2a5205 | 3451 | preempt_enable(); |
9d65cb4a AD |
3452 | return 0; |
3453 | } | |
3454 | } | |
3455 | out: | |
cb2a5205 | 3456 | preempt_enable(); |
9d65cb4a AD |
3457 | return -ERANGE; |
3458 | } | |
3459 | ||
a5c43dae AD |
3460 | int lookup_module_symbol_attrs(unsigned long addr, unsigned long *size, |
3461 | unsigned long *offset, char *modname, char *name) | |
3462 | { | |
3463 | struct module *mod; | |
3464 | ||
cb2a5205 | 3465 | preempt_disable(); |
d72b3751 | 3466 | list_for_each_entry_rcu(mod, &modules, list) { |
0d21b0e3 RR |
3467 | if (mod->state == MODULE_STATE_UNFORMED) |
3468 | continue; | |
a06f6211 MH |
3469 | if (within_module_init(addr, mod) || |
3470 | within_module_core(addr, mod)) { | |
a5c43dae AD |
3471 | const char *sym; |
3472 | ||
3473 | sym = get_ksymbol(mod, addr, size, offset); | |
3474 | if (!sym) | |
3475 | goto out; | |
3476 | if (modname) | |
9281acea | 3477 | strlcpy(modname, mod->name, MODULE_NAME_LEN); |
a5c43dae | 3478 | if (name) |
9281acea | 3479 | strlcpy(name, sym, KSYM_NAME_LEN); |
cb2a5205 | 3480 | preempt_enable(); |
a5c43dae AD |
3481 | return 0; |
3482 | } | |
3483 | } | |
3484 | out: | |
cb2a5205 | 3485 | preempt_enable(); |
a5c43dae AD |
3486 | return -ERANGE; |
3487 | } | |
3488 | ||
ea07890a AD |
3489 | int module_get_kallsym(unsigned int symnum, unsigned long *value, char *type, |
3490 | char *name, char *module_name, int *exported) | |
1da177e4 LT |
3491 | { |
3492 | struct module *mod; | |
3493 | ||
cb2a5205 | 3494 | preempt_disable(); |
d72b3751 | 3495 | list_for_each_entry_rcu(mod, &modules, list) { |
0d21b0e3 RR |
3496 | if (mod->state == MODULE_STATE_UNFORMED) |
3497 | continue; | |
1da177e4 LT |
3498 | if (symnum < mod->num_symtab) { |
3499 | *value = mod->symtab[symnum].st_value; | |
3500 | *type = mod->symtab[symnum].st_info; | |
098c5eea | 3501 | strlcpy(name, mod->strtab + mod->symtab[symnum].st_name, |
9281acea TH |
3502 | KSYM_NAME_LEN); |
3503 | strlcpy(module_name, mod->name, MODULE_NAME_LEN); | |
ca4787b7 | 3504 | *exported = is_exported(name, *value, mod); |
cb2a5205 | 3505 | preempt_enable(); |
ea07890a | 3506 | return 0; |
1da177e4 LT |
3507 | } |
3508 | symnum -= mod->num_symtab; | |
3509 | } | |
cb2a5205 | 3510 | preempt_enable(); |
ea07890a | 3511 | return -ERANGE; |
1da177e4 LT |
3512 | } |
3513 | ||
3514 | static unsigned long mod_find_symname(struct module *mod, const char *name) | |
3515 | { | |
3516 | unsigned int i; | |
3517 | ||
3518 | for (i = 0; i < mod->num_symtab; i++) | |
54e8ce46 KO |
3519 | if (strcmp(name, mod->strtab+mod->symtab[i].st_name) == 0 && |
3520 | mod->symtab[i].st_info != 'U') | |
1da177e4 LT |
3521 | return mod->symtab[i].st_value; |
3522 | return 0; | |
3523 | } | |
3524 | ||
3525 | /* Look for this name: can be of form module:name. */ | |
3526 | unsigned long module_kallsyms_lookup_name(const char *name) | |
3527 | { | |
3528 | struct module *mod; | |
3529 | char *colon; | |
3530 | unsigned long ret = 0; | |
3531 | ||
3532 | /* Don't lock: we're in enough trouble already. */ | |
cb2a5205 | 3533 | preempt_disable(); |
1da177e4 LT |
3534 | if ((colon = strchr(name, ':')) != NULL) { |
3535 | *colon = '\0'; | |
3536 | if ((mod = find_module(name)) != NULL) | |
3537 | ret = mod_find_symname(mod, colon+1); | |
3538 | *colon = ':'; | |
3539 | } else { | |
0d21b0e3 RR |
3540 | list_for_each_entry_rcu(mod, &modules, list) { |
3541 | if (mod->state == MODULE_STATE_UNFORMED) | |
3542 | continue; | |
1da177e4 LT |
3543 | if ((ret = mod_find_symname(mod, name)) != 0) |
3544 | break; | |
0d21b0e3 | 3545 | } |
1da177e4 | 3546 | } |
cb2a5205 | 3547 | preempt_enable(); |
1da177e4 LT |
3548 | return ret; |
3549 | } | |
75a66614 AK |
3550 | |
3551 | int module_kallsyms_on_each_symbol(int (*fn)(void *, const char *, | |
3552 | struct module *, unsigned long), | |
3553 | void *data) | |
3554 | { | |
3555 | struct module *mod; | |
3556 | unsigned int i; | |
3557 | int ret; | |
3558 | ||
3559 | list_for_each_entry(mod, &modules, list) { | |
0d21b0e3 RR |
3560 | if (mod->state == MODULE_STATE_UNFORMED) |
3561 | continue; | |
75a66614 AK |
3562 | for (i = 0; i < mod->num_symtab; i++) { |
3563 | ret = fn(data, mod->strtab + mod->symtab[i].st_name, | |
3564 | mod, mod->symtab[i].st_value); | |
3565 | if (ret != 0) | |
3566 | return ret; | |
3567 | } | |
3568 | } | |
3569 | return 0; | |
3570 | } | |
1da177e4 LT |
3571 | #endif /* CONFIG_KALLSYMS */ |
3572 | ||
21aa9280 | 3573 | static char *module_flags(struct module *mod, char *buf) |
fa3ba2e8 FM |
3574 | { |
3575 | int bx = 0; | |
3576 | ||
0d21b0e3 | 3577 | BUG_ON(mod->state == MODULE_STATE_UNFORMED); |
21aa9280 AV |
3578 | if (mod->taints || |
3579 | mod->state == MODULE_STATE_GOING || | |
3580 | mod->state == MODULE_STATE_COMING) { | |
fa3ba2e8 | 3581 | buf[bx++] = '('; |
cca3e707 | 3582 | bx += module_flags_taint(mod, buf + bx); |
21aa9280 AV |
3583 | /* Show a - for module-is-being-unloaded */ |
3584 | if (mod->state == MODULE_STATE_GOING) | |
3585 | buf[bx++] = '-'; | |
3586 | /* Show a + for module-is-being-loaded */ | |
3587 | if (mod->state == MODULE_STATE_COMING) | |
3588 | buf[bx++] = '+'; | |
fa3ba2e8 FM |
3589 | buf[bx++] = ')'; |
3590 | } | |
3591 | buf[bx] = '\0'; | |
3592 | ||
3593 | return buf; | |
3594 | } | |
3595 | ||
3b5d5c6b AD |
3596 | #ifdef CONFIG_PROC_FS |
3597 | /* Called by the /proc file system to return a list of modules. */ | |
3598 | static void *m_start(struct seq_file *m, loff_t *pos) | |
3599 | { | |
3600 | mutex_lock(&module_mutex); | |
3601 | return seq_list_start(&modules, *pos); | |
3602 | } | |
3603 | ||
3604 | static void *m_next(struct seq_file *m, void *p, loff_t *pos) | |
3605 | { | |
3606 | return seq_list_next(p, &modules, pos); | |
3607 | } | |
3608 | ||
3609 | static void m_stop(struct seq_file *m, void *p) | |
3610 | { | |
3611 | mutex_unlock(&module_mutex); | |
3612 | } | |
3613 | ||
1da177e4 LT |
3614 | static int m_show(struct seq_file *m, void *p) |
3615 | { | |
3616 | struct module *mod = list_entry(p, struct module, list); | |
fa3ba2e8 FM |
3617 | char buf[8]; |
3618 | ||
0d21b0e3 RR |
3619 | /* We always ignore unformed modules. */ |
3620 | if (mod->state == MODULE_STATE_UNFORMED) | |
3621 | return 0; | |
3622 | ||
2f0f2a33 | 3623 | seq_printf(m, "%s %u", |
1da177e4 LT |
3624 | mod->name, mod->init_size + mod->core_size); |
3625 | print_unload_info(m, mod); | |
3626 | ||
3627 | /* Informative for users. */ | |
3628 | seq_printf(m, " %s", | |
3629 | mod->state == MODULE_STATE_GOING ? "Unloading": | |
3630 | mod->state == MODULE_STATE_COMING ? "Loading": | |
3631 | "Live"); | |
3632 | /* Used by oprofile and other similar tools. */ | |
9f36e2c4 | 3633 | seq_printf(m, " 0x%pK", mod->module_core); |
1da177e4 | 3634 | |
fa3ba2e8 FM |
3635 | /* Taints info */ |
3636 | if (mod->taints) | |
21aa9280 | 3637 | seq_printf(m, " %s", module_flags(mod, buf)); |
fa3ba2e8 | 3638 | |
1da177e4 LT |
3639 | seq_printf(m, "\n"); |
3640 | return 0; | |
3641 | } | |
3642 | ||
3643 | /* Format: modulename size refcount deps address | |
3644 | ||
3645 | Where refcount is a number or -, and deps is a comma-separated list | |
3646 | of depends or -. | |
3647 | */ | |
3b5d5c6b | 3648 | static const struct seq_operations modules_op = { |
1da177e4 LT |
3649 | .start = m_start, |
3650 | .next = m_next, | |
3651 | .stop = m_stop, | |
3652 | .show = m_show | |
3653 | }; | |
3654 | ||
3b5d5c6b AD |
3655 | static int modules_open(struct inode *inode, struct file *file) |
3656 | { | |
3657 | return seq_open(file, &modules_op); | |
3658 | } | |
3659 | ||
3660 | static const struct file_operations proc_modules_operations = { | |
3661 | .open = modules_open, | |
3662 | .read = seq_read, | |
3663 | .llseek = seq_lseek, | |
3664 | .release = seq_release, | |
3665 | }; | |
3666 | ||
3667 | static int __init proc_modules_init(void) | |
3668 | { | |
3669 | proc_create("modules", 0, NULL, &proc_modules_operations); | |
3670 | return 0; | |
3671 | } | |
3672 | module_init(proc_modules_init); | |
3673 | #endif | |
3674 | ||
1da177e4 LT |
3675 | /* Given an address, look for it in the module exception tables. */ |
3676 | const struct exception_table_entry *search_module_extables(unsigned long addr) | |
3677 | { | |
1da177e4 LT |
3678 | const struct exception_table_entry *e = NULL; |
3679 | struct module *mod; | |
3680 | ||
24da1cbf | 3681 | preempt_disable(); |
d72b3751 | 3682 | list_for_each_entry_rcu(mod, &modules, list) { |
0d21b0e3 RR |
3683 | if (mod->state == MODULE_STATE_UNFORMED) |
3684 | continue; | |
1da177e4 LT |
3685 | if (mod->num_exentries == 0) |
3686 | continue; | |
22a8bdeb | 3687 | |
1da177e4 LT |
3688 | e = search_extable(mod->extable, |
3689 | mod->extable + mod->num_exentries - 1, | |
3690 | addr); | |
3691 | if (e) | |
3692 | break; | |
3693 | } | |
24da1cbf | 3694 | preempt_enable(); |
1da177e4 LT |
3695 | |
3696 | /* Now, if we found one, we are running inside it now, hence | |
22a8bdeb | 3697 | we cannot unload the module, hence no refcnt needed. */ |
1da177e4 LT |
3698 | return e; |
3699 | } | |
3700 | ||
4d435f9d | 3701 | /* |
e610499e RR |
3702 | * is_module_address - is this address inside a module? |
3703 | * @addr: the address to check. | |
3704 | * | |
3705 | * See is_module_text_address() if you simply want to see if the address | |
3706 | * is code (not data). | |
4d435f9d | 3707 | */ |
e610499e | 3708 | bool is_module_address(unsigned long addr) |
4d435f9d | 3709 | { |
e610499e | 3710 | bool ret; |
4d435f9d | 3711 | |
24da1cbf | 3712 | preempt_disable(); |
e610499e | 3713 | ret = __module_address(addr) != NULL; |
24da1cbf | 3714 | preempt_enable(); |
4d435f9d | 3715 | |
e610499e | 3716 | return ret; |
4d435f9d IM |
3717 | } |
3718 | ||
e610499e RR |
3719 | /* |
3720 | * __module_address - get the module which contains an address. | |
3721 | * @addr: the address. | |
3722 | * | |
3723 | * Must be called with preempt disabled or module mutex held so that | |
3724 | * module doesn't get freed during this. | |
3725 | */ | |
714f83d5 | 3726 | struct module *__module_address(unsigned long addr) |
1da177e4 LT |
3727 | { |
3728 | struct module *mod; | |
3729 | ||
3a642e99 RR |
3730 | if (addr < module_addr_min || addr > module_addr_max) |
3731 | return NULL; | |
3732 | ||
0d21b0e3 RR |
3733 | list_for_each_entry_rcu(mod, &modules, list) { |
3734 | if (mod->state == MODULE_STATE_UNFORMED) | |
3735 | continue; | |
e610499e RR |
3736 | if (within_module_core(addr, mod) |
3737 | || within_module_init(addr, mod)) | |
1da177e4 | 3738 | return mod; |
0d21b0e3 | 3739 | } |
1da177e4 LT |
3740 | return NULL; |
3741 | } | |
c6b37801 | 3742 | EXPORT_SYMBOL_GPL(__module_address); |
1da177e4 | 3743 | |
e610499e RR |
3744 | /* |
3745 | * is_module_text_address - is this address inside module code? | |
3746 | * @addr: the address to check. | |
3747 | * | |
3748 | * See is_module_address() if you simply want to see if the address is | |
3749 | * anywhere in a module. See kernel_text_address() for testing if an | |
3750 | * address corresponds to kernel or module code. | |
3751 | */ | |
3752 | bool is_module_text_address(unsigned long addr) | |
3753 | { | |
3754 | bool ret; | |
3755 | ||
3756 | preempt_disable(); | |
3757 | ret = __module_text_address(addr) != NULL; | |
3758 | preempt_enable(); | |
3759 | ||
3760 | return ret; | |
3761 | } | |
3762 | ||
3763 | /* | |
3764 | * __module_text_address - get the module whose code contains an address. | |
3765 | * @addr: the address. | |
3766 | * | |
3767 | * Must be called with preempt disabled or module mutex held so that | |
3768 | * module doesn't get freed during this. | |
3769 | */ | |
3770 | struct module *__module_text_address(unsigned long addr) | |
3771 | { | |
3772 | struct module *mod = __module_address(addr); | |
3773 | if (mod) { | |
3774 | /* Make sure it's within the text section. */ | |
3775 | if (!within(addr, mod->module_init, mod->init_text_size) | |
3776 | && !within(addr, mod->module_core, mod->core_text_size)) | |
3777 | mod = NULL; | |
3778 | } | |
3779 | return mod; | |
3780 | } | |
c6b37801 | 3781 | EXPORT_SYMBOL_GPL(__module_text_address); |
e610499e | 3782 | |
1da177e4 LT |
3783 | /* Don't grab lock, we're oopsing. */ |
3784 | void print_modules(void) | |
3785 | { | |
3786 | struct module *mod; | |
2bc2d61a | 3787 | char buf[8]; |
1da177e4 | 3788 | |
b231125a | 3789 | printk(KERN_DEFAULT "Modules linked in:"); |
d72b3751 AK |
3790 | /* Most callers should already have preempt disabled, but make sure */ |
3791 | preempt_disable(); | |
0d21b0e3 RR |
3792 | list_for_each_entry_rcu(mod, &modules, list) { |
3793 | if (mod->state == MODULE_STATE_UNFORMED) | |
3794 | continue; | |
21aa9280 | 3795 | printk(" %s%s", mod->name, module_flags(mod, buf)); |
0d21b0e3 | 3796 | } |
d72b3751 | 3797 | preempt_enable(); |
e14af7ee AV |
3798 | if (last_unloaded_module[0]) |
3799 | printk(" [last unloaded: %s]", last_unloaded_module); | |
1da177e4 LT |
3800 | printk("\n"); |
3801 | } | |
3802 | ||
1da177e4 | 3803 | #ifdef CONFIG_MODVERSIONS |
8c8ef42a RR |
3804 | /* Generate the signature for all relevant module structures here. |
3805 | * If these change, we don't want to try to parse the module. */ | |
3806 | void module_layout(struct module *mod, | |
3807 | struct modversion_info *ver, | |
3808 | struct kernel_param *kp, | |
3809 | struct kernel_symbol *ks, | |
65498646 | 3810 | struct tracepoint * const *tp) |
8c8ef42a RR |
3811 | { |
3812 | } | |
3813 | EXPORT_SYMBOL(module_layout); | |
1da177e4 | 3814 | #endif |